"Lost One's Weeping" is an original song by Neru. It was first uploaded on March 4, 2013. It is a song about questioning the burdens of education.
This song has entered the Hall of Fame on March 6, 2013 after 1 day, 13 hours, and 22 minutes; and the Hall of Legend on May 24, 2013. It also exceeded over 10 million YouTube views and received lots of Vocaloid, Utau, and Utaite covers.
Hence, this is Neru's most notable song, alongside "Law-evading Rock"; and Kagamine Rin's most notable song.
from vocaloid.fandom.com

Original upload date: 17.03.2016
The first track I've ever uploaded... The start of my journey of modding.
The first version didn't make it due to the fact it was poorly made. The second version wasn't worth to bring back.
All that's left is the remix version.

"Ghost Rule" is an original song by DECO*27. It is one of his first songs after a brief hiatus in making music (at least in the VOCALOID field).
One interpretation of the song is that the singer (Miku) is a compulsive liar, whose life has been ruined by her constant contradictions and lies. It addresses her remorse for her own actions, though believing she cannot go back anymore.
This song became an instant hit on NicoNico, entering the Hall of Fame within the week of its publication. It later entered the Hall of Legend and exceeded over 10 million YouTube views. It also received lots of Vocaloid, Utau, and Utaite covers.

vocaloid.fandom.com

The sixth and the first track made by me after 2018, because something decided to be resurrected.
It doesn't use the original track. It's also short, yet, I think this was one of the best track mods I made.

"Koi wa Sensou" is a rock-genre song about how a singer (Miku) will fight to attain her crush, who is in love with someone else. Miku declares that "love is war" and that in the end, she will make her love see only her.
"Koi wa Sensou" is one of Miku's older hits and has covers featuring almost every official VOCALOID. Due to the song's popularity, it has been translated many times into various languages by different translators. Additionally, it was the eighth song to enter the Hall of Legend (term used for VOCALOID videos) that have gained 1,000,000+ views on Niconico, on November 4, 2008.

Original upload date:: 30.11.2018
The fifth and the last track I've made before leaving PAYDAY 2 modding scene... to come back eventually.

"Streaming Heart" is featured in the album Conti New, which was released March 26, 2014. Additionally, this song has made it into the Hall of Legend, reaching over a million views.
The lyrics of this song are unusually vague, so that even the perspective of the singer is ambiguous. In both cases, the song is about the ending of an abusive relationship. Both the man and the woman in the relationship know that it isn't working out, but the girl is passive and is afraid to speak up, while the guy is too full of pride to drop things.
The first interpretation is from the perspective of the man. He begins to see another girl(Miku) while still in his relationship. The second interpretation says that Miku is representing the heart of the girl, and the song is also sung from that perspective. Her heart is pushing the girl to leave the relationship, but she can't quite do it. The heart manipulates the girl into finally resolving to end the relationship. Even when the boy tries to keep her, she manages to get him out of her life.
vocaloid.fandom.com

Original upload date:: 27.05.2016
The second track I've ever made. Honestly, I have no idea why this track was used at all. But I'm not going to judge my past self.

The song was first uploaded on August 14, 2011, and is Neru's seventh work uploaded. The boy in the video is named Teddy.
The song is rather vague, and so several interpretations can be made.
A possible meaning for the song is that the boy named Teddy runs away from home and his family, thinking that he has a "crazy filled mind". He appears to hate his life and wants to change.
In the song, he struggles with why he needs to change, seen in the lyrics; "Make a fool of yourself." Either these are his parent's words to him, or these are his own thoughts. He appears to fear that changing can only make him a mere fool.
In other lyrics, he asks why he can't just be loved; possibly by his family; and expresses wishes to cut his face off with scissors.

vocaloid.wikia.com

Original upload date:: 31.12.2017
The fourth track. I'm still not satisfied with it, but I can't make it better. Maybe some remix could spice things up...

"I think that the environment encircling VOCALOID has changed a fair bit since I was in it. Using the opportunity of having the matter of the theme song being given to me, I thought: if I, as Hachi, were to make a song with Miku now, what would be the most appropriate? This was the result. While reminiscing of the VOCALOID landscape that I saw and the castles we had built in the sandbox, and seeking the perfect balance between nostalgic feelings and new feelings, there was the "sand planet."
*- Hachi' comment*

Original upload date:: 31.08.2017
The third track I've made after spending the year serving the army. Even then, I've not stayed for too long in the modding scene.
The first version of the track had another remix in the assault part and didn't make it because I simply got numb to it.
Also, this was made due to Hatsune Miku's 10th anniversary.

"Bitter Majesty" is an original song by Hachioji-P. Ironically, it was uploaded on Valentine's Day. This song can be viewed as the spiritual successor to another author' song, "Sweet Devil", in terms of style.

vocaloid.fandom.com

Yeah, that's all. You don't read this stuff anyway.

Original upload date:: 30.08.2020
The seventh track. I believe this one out of others got the most attention.
Also, this was made due to Hatsune Miku's 13th anniversary, alongside with this weapon skin and this exact pack.

Credits to MidoriMint for the original mod.

"Meltdown" is an original song by iroha(sasaki) and is widely regarded as his best work.
There are various interpretations of this song.
The PV can be literally interpreted as singer (Rin) jumping into a nuclear reactor to commit suicide, or it can be interpreted figuratively as Rin trying to get rid of her past or purge herself of her sins in order to grow up and become an adult.
Iroha has said the lyrics and video represent conflicts in the singer's inner psychological world. In the video, Rin jumps into a reactor core/nuclear reactor and chokes someone, possibly to death. The little Rin stands for innocent childish mind inside her. The choking scene symbolizes erasing her past self and starting anew.

Original upload date: date: 17.09.2020
The eighth track. Seems like this one is the least liked track out of everything. Either people dislike it, or there was no point to download it when this pack was updated with this track included as well...
But I redid it.

"DYE" is a song featuring Megurine Luka by AVTechNO!. The song deals with wanting to retain individuality, while not overly standing out, and being accepted by society. The song contained extended use of the word "dyed" as a metaphor.
Backtrack is dark and warped. Large amounts of synthesizer and the mixing of Luka's voice with the lyrics make it very difficult for even English-speaking listeners to understand the song without the lyrics provided on AVTechNO!'s website.

from vocaloid.fandom.com

Original upload date:: 06.12.2020
Now that I think about it, it seems like I made a poor job to this track... But I don't know why - there's nothing I could do.
Also, no vocals. At all. Poor Luka...

Yes, I have the guts to combine two songs' names into one. And no, this is not a mashup.

"Luka Luka☆Night Fever" is samfree's first original work using Megurine Luka and became one of Luka's most notable early hits. It's a eurobeat song of a 2D woman who wants to break through the "dimensions".
Five days after it was uploaded, the song quickly became popular and reached hall of fame (exceeding 100,000 views). It also ranked the Vocaloid Weekly ranking number 72 (rank 6). One year after it was uploaded (March 7, 2010) the song reached 1 million views.

"Yuka Yuka☆Heavenly Night" is the fourteenth entry in samfree's popular Night Series of eurobeat songs. It peaked on the Weekly Vocaloid Ranking at spot #7, during weeks #335 and #336.
This song has entered the Hall of Fame. It is also samfree's last Vocaloid Night Series song he produced before his death on September 24, 2015.

Original upload date:: 12.02.2021
Note: heisting while listening to eurobeat might be not the best idea.

...Also, I don't think there's any point to table the context about each event's track, so I won't make it here :)

"This is an original song by wowaka and is one of his most notable songs.
The lyrics are vague, but the most common interpretation of the song is that it is about the confusion of a girl in love or the mess in her life after she gets pregnant. She falls in love with a boy who uses her for sex; after finding out she is pregnant, he leaves her, and she tries to fill the void with other people.
There are rumors that Wowaka has stated that this is not the true meaning of the song, although this is unsourced and therefore unreliable information. If so, Two-Faced Lovers is just about the confusing dilemma of love, not anything that would make this song inappropriate for younger audiences."[/color]
vocaloid.fandom.com

Original upload date: Was made exclusively for this pack.
Fun fact: I used it with "The Lost One's Weeping" as stealth/control part for my first ever mod. Biggest mistake I made.
I hope that this is not one of them...