Deezer

France based Deezer is the first music search engine that is undeniably legal. In their earlier incarnation as blogmusik.com, Deezer was pressured by the French government to alter their service, which they thought was skirting copyright laws. Since then, Deezer has ironed out their differences with the government by agreeing to share revenue with artists and producers. Thus, Deezer is legit like Pandora and lala, with the added advantage of being able to choose which songs you want listen to, as opposed to the radio style service of the aforementioned two.