Tangerine! lets you easily create playlists of upbeat music, or playlists for relaxing. It works by analyzing the BPM and the beat intensity of your music. Spend your time listening to music, not making playlists.
• Fixes a bug where saving a playlist to iTunes 12.0.1 would fail
• OS X Yosemite compatibility improvements
Stars by Karelia 
The Hit List 
Sandvox 