If you're looking for new music you won't find a shortage of music discovery services online. Almost all of them search their own music catalogues and not the vast assortment of online radio. RadioTuna brings music discovery to online radio.
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When you visit RadioTuna you can dive right in by searching by genre, artist, and song to begin listening. Radio stations suggested by RadioTuna are given rankings to show you how much of a certain type of music they play. You can bookmark radio stations you find and then review your listening history, see the play charts from your saved stations, and share the stations you listen to with friends through social networks like Facebook and Twitter.
RadioTuna provides a more in-depth method for discovering music online than simply searching a directory of radio stations and hoping to find one that plays songs you'd like. You can check out RadioTuna without signing up but saving stations and your search history requires a free login. If you have a music discovery service you can't live without, let's hear about it in the comments.