Online Music – $0
Pandora is a free internet radio service that helps you find new music. You start by creating a “Station” with an artist or song title. After that, Pandora automagically streams music featuring similar artists and songs. Pandora is great if you’re in front of your computer all day and want to hear some new music.
Napster allows you to listen to every track in their 2 million song catalog up to 3 times for free. These are ENTIRE songs, not lame ass 30 second samples. Napster is good if you want to sample a song before you download it on BitTorrent or a P2P service…not that I know anything about that…
iLike is a relatively new service that acts as an enhancement to iTunes. You have to install their software, which adds a sidebar to iTunes. Whenever you play a song, the sidebar generates recommendations to similar songs/artists which you can download for free. iLike is made by the guys from GarageBand, so all the recommendations come from GarageBand’s song database.