What I've found so far:
SOUNDS/MUSIC/SONGS/SONG1003 - After School Special
SOUNDS/MUSIC/SONGS/SONG1010 - Distort (alternate)
SOUNDS/MUSIC/SONGS/SONG1013 - Peaceful (alternate)
SOUNDS/MUSIC/LOOPS/88B - Ambient Deep (sampled from
https://www.youtube.com/watch?v=wGUukvE9iFg )
SOUNDS/MUSIC/LOOPS/80D - Bass1
SOUNDS/MUSIC/LOOPS/120O - Bass2
SOUNDS/MUSIC/LOOPS/120N - Bass3
SOUNDS/MUSIC/LOOPS/80N - Creepy
SOUNDS/MUSIC/LOOPS/80Q - Distort
SOUNDS/MUSIC/LOOPS/95B - Drums
SOUNDS/MUSIC/LOOPS/120AM - Factory
SOUNDS/MUSIC/LOOPS/120AL - Icy
SOUNDS/MUSIC/LOOPS/122W - Jungle
SOUNDS/MUSIC/LOOPS/80U - Peaceful
SOUNDS/MUSIC/LOOPS/80S - Piano Bass
SOUNDS/MUSIC/LOOPS/120W - Rock
SOUNDS/MUSIC/LOOPS/87A - Stress
SOUNDS/MUSIC/LOOPS/110D - After School Special Stem 1
SOUNDS/MUSIC/LOOPS/110F - After School Special Stem 2
SOUNDS/MUSIC/LOOPS/110H - After School Special Stem 3
SOUNDS/MUSIC/NOTES/SYNTH4/ - Main menu sounds
SOUNDS/SFX/BEEP/ - Beeps and alarm sounds
SOUNDS/MUSIC/FX/FX1001 - Connection
SOUNDS/MUSIC/FX/FX1011 - Push broom
SOUNDS/MUSIC/FX/FX1067 - Printer
SOUNDS/MUSIC/KBFX/HITONES/KBHI1000 - Wand hit
SOUNDS/MUSIC/KBFX/ZIPNZAP/KBZP1001 - Slow Impact
SOUNDS/MUSIC/KBFX/ZIPNZAP/KBZP1002 - Fast Impact
SOUNDS/MUSIC/KBFX/Darktone/KBDK1003 - Clear bricks
SOUNDS/MUSIC/KBFX/BEEPS/KBBE1014 - Save upload start
SOUNDS/MUSIC/KBFX/BEEPS/KBBE1015 - Save upload end
SOUNDS/MUSIC/KBFX/BEEPS/KBBE1016 - Admin connection
SOUNDS/MUSIC/KBFX/BEEPS/KBBE1017 - Bricks loaded
SOUNDS/MUSIC/KBFX/BEEPS/KBBE1025 - Disconnection
SOUNDS/MUSIC/KBFX/ORGANIC/KBOR1001 - Player spawn
SOUNDS/SFX/NOISES/NOIS1034 - Brick plant
SOUNDS/SFX/IMPACTS/IMPA1025 - Vehicle mount
SOUNDS/SFX/IMPACTS/IMPA1046 - Spear fire
SOUNDS/SFX/WEAPONS/WEAP1000 - Rocket explosion
SOUNDS/SFX/WEAPONS/WEAP1001 - Spear explosion
SOUNDS/SFX/WEAPONS/WEAP1005 - Gun fire