Last.fm is such a great 音楽 site. After creating your own account, Last.fm listens to what 音楽 あなた listen to and eventually plays your field of 音楽 and nothing else ;)
Last.fm is the best site. あなた can listen to music, discover artists, chat to people, plus it generates your 上, ページのトップへ listened songs and artists. The most fun bit though is あなた can compare your 音楽 taste with other users, and make フレンズ または whatever :)