Music subscription services never quite struck gold with Internet users, but now that the smartphone is becoming the era’s standard listening device, a new gold rush is on. Established music services like Rhapsody, Pandora and Slacker continue to improve mobile service, but they are suddenly facing new mobile music competition. Depending on a person’s phone, budget and listening habits, the new services may be a better call. The services seem to be converging on the same target — namely, apps that let users hear personalized radio stations, build play lists and store songs for offline listening. No service has all of these features for all mobile platforms, but they are making progress. Rhapsody’s Premier service ($10 a month), for instance, is great for iPhone users, good for people with Android phones and useless on a BlackBerry until Rhapsody’s BlackBerry app arrives later this summer. Users can create play lists or listen Read More