San Diego - Slacker, the maker of a portable music player and corresponding radio service, announced on Tuesday that it has signed agreements with EMI Music Publishing, Sony/ATV Music Publishing (NYSE: SNE), Universal Music Publishing Group and Warner/Chappell Music (NYSE: WMG), which will allow users to transfer songs from its online radio service to Slacker portable players. The company said the deals were completed before it launched its Slacker Portable hit the market in November. Slacker lets users create interactive radio stations; songs from the stations are then periodically updated on the portable player. A premium version that allows users to permanently store songs is also available starting at $7.50 per month.