Seishun Complex, Rockn' Roll, Morning Light Falls on You and That Band (But with the cool and awesome improv solo).

Has two versions.
Custom Menu Tracks adds them to the jukebox as custom tracks, so you can also listen to the default music.
Menu Track Replacements replaces Main Menu, Preplanning and Loadout, a crude but effective method.

Intended to be used with Main Menu Jukebox by @Pol1us.

This mod is apart of The Bocchi the Rock! Definitive Package, check it out if you're interested in completely Bocchi'fying your game.