The web is littered with music — given away for free, embeded in videos, and so on. Puniz indexes publicly accessible music and lets you grab the source tune.
You can search music by the song, artist or keyword as well as variations and closely related searches — a search for the song "Safety Dance", for example, returns the original song as well as remixes and covers of it.
Click on a song to listen to it online or download it as an FLV, MP4 or 3GP file. The service doesn't have any playlist functionality, but since you can download the songs directly and the mix them into playlists in your preferred music application this isn't much of an issue. Puniz is free and requires no registration.
Note: Puniz has a downloadable client. It's an extremely basic media player with the ability to search Puniz for music. In our tests it crashed frequently and didn't offer anything that downloading the music directly from Puniz and playing in your own player wouldn't provide.