Spotify - Map shows when two people play same song at same time
Noted - Social music discovery
MusicHarbor - MusicHarbor is an app that helps you stay on top of new music releases, music videos, events, and news from all your favorite artists and record labels.
MTME - A new way to discover music
Tubenab - Discover and convert YouTube videos to MP3 & MP4
spool.tv - Just music videos.