List of sound playables on this page (11 files):

quartet - 01 - title screen.vgm
quartet - 02 - round 1.vgm
quartet - 03 - round 2.vgm
quartet - 03 - round clear.vgm
quartet - 04 - round 3.vgm
quartet - 05 - round 4.vgm
quartet - 06 - round 5.vgm
quartet - 07 - round 6.vgm
quartet - 08 - final boss.vgm
quartet - 09 - ending.vgm
quartet - 10 - game over.vgm