The game plan is simple enough. Customers who purchase a medium or full-size meal at participating Wendy’s will also receive a unique code redeemable for any song from Rhapsody’s 4.5 million-tune library. This is one better than the recent Starbucks / iTunes Wireless promotion if only because customers did not get to pick the song.

Along with the free tunes, Wendy’s customers will also be able to enter the “Combo Up To Download” sweepstakes where the prizes include a 50-song download bundle from Rhapsody or one of 100 SanDisk Sansa e280R Rhapsody MP3 players.

“Rhapsody is all about feeding consumers’ passion for music,” Rhapsody head honcho Michael Bloom said. “Wendy’s new giveaway lets customers enjoy their favorite food and music, and introduces them to Rhapsody all at once.”