This mod allows you to select music in main menu. This mod is not perfect.

Usage:
Press right button or left button to select preferred music. (UI)
Press Randomization ("Randomized" or "Not Randomized") button to randomize or not randomize music. (UI)
Press Z button to hide/show Jukebox UI. (Keyboard) (Will appear each time you go to the main menu)

Features:

1. Contains 3 tracks: Main Menu (MusicMenu_MainMenu), Loadout (MusicMenu_Loadout), and Preplanning (MusicMenu_Preplanning).
2. Music randomization.
3. Text.
4. Save file. Should you exit the game, there will be a save file which contains random song, and what last song you selected.

Limitations:

1. Will need to update UI.
2. Spaghetti blueprints. If you are not a developer, it shouldn't really affect you. If you notice slowdowns while using this mod, please leave a comment.
3. Mod only works when you load into main menu (duh). This means that if you exit the heist (during the loading screen), or start the game, it will only play Main Menu track, until it finishes loading to the main menu.

Features to add:

• Using a template to load music instead of just plainly loading Ak events. For example, instead of the track name being titled
  "LetsGoShopping", it should be "Let's Go Shopning" for better user experience.
• Loading preferred music during loading screen. Instead of playing Main Menu track, it should play user's preferred music. (Dunno if it's possible, tried it before)
• Better UI.

Once I implement those features, I will consider it done.

Loading custom tracks:
This mod checks the path /Game/Mods/MainMenuJukebox/Music for PDA_MainMenuJukebox class.