Allow previous update's soundtracks to play in the menu alongside new songs

When every new update releases, the music for the previous update gets replaced with that of the next update in the menu. I believe that musics like Below and Above, O's Piano and the 1.20 soundtrack should still be able to play in the menu screen, instead of it just being limited to the music of that update. The music that would be added in future updates should be added instead to a lineup of tracks that can play, something like in game. This ensures that musicians like Aaron Cherof and Kumi Tamioka have their masterpieces heard in not just the ingame experience, but outside of it. I also really like listening to Below and Above in the main menu and it will be a shame for such an amazing track to get removed from the menu. The variety of tracks allows for more immersion in the game, and it would be great if more than one update's tracks played in the menu.