The folks at Slacker Radio have something to cheer about as their great music app has been selected to ship with the Samsung Galaxy Tab. Slacker began a relationship with Samsung Mobile via T-Mobile’s Samsung Vibrant, last year. Slacker Radio, a streaming music app, has become very popular with their ability to stream whole catalogs and fine tune your listening a little better than rival pandora. The Galaxy Tab starts hitting US Shelves in about 2 weeks via T-Mobile, Sprint and Verizon. Although a 4th AT&T Version is expected no release details have surfaced.