Odds are that you werent riveted by Beats Music when it first arrived, but the streaming service has just delivered a pair of big updates that may give you a good excuse to tune in. For the iOS app, the biggest improvement is visible when youre signing up — you can now subscribe from within the software rather than heading to the web. The move makes it that much easier to keep the music flowing after your trial is over, and may just help Beats grow its fledgling customer base.