Blargg picked up Matrixz’ Fireworks techdemo for NES and modified it.

Release notes:

Some changes (source + NES rom, as before): 2009-blargg.zip

– Delayed explosion sound
– Added noise burst to beginning of explosion sound
– Sound of firework shooting from ground
– Eliminated thump at end of explosion sound

http://nesdev.parodius.com/bbs/viewtopic.php?t=4684