If you have iOS8 and play music from your Mac's iTunes library, you'll love this: Today Remote is a free Notifications widget that provides basic music controls in the pull-down Today screen, even if the iPad is locked. No need to launch Remote to pause or adjust the volume quickly, like when the phone rings. Pretty handy if your Mac is the basis of your music system, but lives in another room. You'll still want the Remote app for choosing music to play. No affiliation, just happy to have discovered it.