Last.fm provides recommended artists based on your listening history. You can also manually browse the profiles of similar artists to any particular artist.
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Pro Supports a wide range of platforms, music players and browsers
Last.fm scrobbles music from wide range of devices and music players, not just from official apps such as Scrobbler for Windows and Mac, Scrobbler for iOS, Last.fm for Android and Last.fm for Spotify, but also a wide range of 3rd party Last.fm apps that are available on many platforms, built using the official Last.fm API such as ScrobbleMe for Windows Phone, Simple Last.fm Scrobbler for Android, Last.fm Scrobbler for Chrome, FoxyScrobbler for Firefox and the built-in Last.fm scrobbling in Deezer.
Last.fm checks what you listen to the most, they're calling it scrobbling, and streams songs based on that information. It works via your computer, smartphone, iPod and other music services.
Pro Last.fm Tag/Artist radio
Play songs similar to "X" from Youtube.
Con Lack of compositions
The most popular are there, but forget about something unique.