Starbucks Corp. plans to give away 50 million free digital songs to customers in all of its domestic coffee houses to promote a new wireless iTunes music service that’s about to debut in select markets.

From Oct. 2 to Nov. 7, baristas in the company’s more than 10,000 U.S. stores will hand out about 1.5 million “Song of the Day” cards each day. The cards can be redeemed at Apple Inc.’s online iTunes Store.