Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Spotify - Map shows when two people play same song at same time
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
SoundCloud - Enjoy music & follow favourite artists
Apple Music - Apple Music app combines your personal iTunes library with Apple's music subscription service. Music you have purchased from the iTunes store, or synced over from other sources, is available in the "Library" tab. Read more about Apple Music.