Defonic - Create a unique sound environment at home or in the office
Music For Makers - Licensing good music has never been this easy.
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
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!
Focus Noise - Productivity sounds and color noises to stay focused at work
Incompetech - Royalty Free and Creative Commons Music Archive