Maloja - Simple self-hosted music scrobble database to create personal listening statistics.
Spotify - Map shows when two people play same song at same time
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
Simple Last.fm Scrobbler - Simple Last.fm Scrobbler is a simple app that scrobbles music listened to on an Android phone.
SoundCloud - Enjoy music & follow favourite artists
Pano Scrobbler - Scrobble to lastFM from anything which produces audio with metadata, including video streaming...