Last.fm is connecting people through music, and not just showering people with music. It's sort of a new kind of online radio. A radio that connects you straight with the right music without having to do mind-numbing searches and scrolling endless playlists.
You can read more about it on Last.fm site.
A note: LastFM shares accounts with AudioScrobbler so if you're already using the AudioScrobbler's plugin to upload the info about your favourite music you don't have to register on Last.fm.
See http://www.last.fm/group/Tikiwiki or http://www.audioscrobbler.com/group/Tikiwiki
and feel free to join and share your music taste in Tikiwiki Group !