Access Your Music and Movies on All Your Devices - iConnected: Use AirPlay, iCloud, Apps, and More to Bring Your Apple Devices Together - page 38

Figure 2-13
iTunes Match needs to be switched on to be accessed from an iOS device, then it can
download your music library list.
TIP: If you decide you don't want a song stored on your device any longer, swipe to the left over
its name in the songs list and then tap the Delete button that appears. The song is still available via
iCloud but is no longer stored on that device.