Audio Hero - Over 250,000 royalty free music & sound effects for videos
Tinkersynth - Create and purchase unique generative art
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
Sampulator - Make (and record) beats on your keyboard
Premiumbeat - Premiumbeat.com provides high quality Royalty Free Music.
Splice Beat Maker - Make and share beats in your browser