You could discover a song on Pandora, search for more by the artist on Spotify, and get context from satellite radio DJs, or do it all in one place with Slacker. After hitting 4 million monthly users ...

Way back in March of 2010, nifty Internet radio service Slacker began demoing features for on-demand listening, putting it more squarely in competition with Rhapsody, Napster, and other ...