“Sip on a mocha latte while using headphones to listen to any of 250,000 songs you call up on a computer. Then order the ones you like — burned on your own CD — to go… BusinessWeek has learned that on Mar. 16, the Seattle coffee giant will unveil an in-store music service allowing customers to do just that, using Hewlett-Packard (HPQ ) tablet computers to make their choices. The first musical Starbucks opens in Santa Monica, Calif., and the service will expand into 2,500 stores over the next two years.” It is hard to tell if this has any chance of succeeding to an extent that would justify the enormous hardware costs; it depends on whether it will tap a customer base essentially different than iTunes users and the like, and whether the song selection and ease of use of the interface are beckoning.