That positive sentiment is all nice, and it has been somewhat backed by informal polls such as the one at 9to5Mac that we covered yesterday. But the more informative earnings calls will be the ones later this year, where investors will surely call on Apple Music to put up figures reflecting paid subscriptions. At that point, Apple will need to either share some data or give suspiciously vague assurances. The three-month free trial gives Apple a bit of a grace period to not just get listeners on board, but to keep them there.