Music For Makers - Licensing good music has never been this easy.
Animista - Create beautiful CSS animations in your browser
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!
Keyframes.app - A timeline editor for CSS animations
Incompetech - Royalty Free and Creative Commons Music Archive
CSS Animation Cheat Sheet - Awesome CSS3 plugin for spiffy animations