1. www.youtube.com can have music on their site and is free.
www.last.fm is an online music radio and you cant download the music off it.
http://new.music.yahoo.com is a new and free and has music on their website to stream on your computer.
2. www.napster.co.uk Napster is a paid service when you pay £5 and you get 5 songs to keep and 8 million songs to listen to.
http://mp3.rhapsody.com/home.html is another paid service. You pay for each album.
www.eMusic.com is a website where you pay a monthly service and you get to listen to music and get to keep a few.
3. Downloading music off of illegal websites is a breach of copyright and is punishable by law. It also makes your computer vulnerable to different types of viruses and spy-ware.