HT4448: About Apple TV (2nd and 3rd generation) software updatesLearn about About Apple TV (2nd and 3rd generation) software updates
Currently Being ModeratedFeb 7, 2013 8:48 PM (in response to susiefromcamden)
Not sure what you mean by add more music as The device has no storage. The music section would be for music you've purchased, streaming from iCloud (if you have iTunes Match you would be able to stream your full library)
The computers section allows you to access your full library via home-sharing provided your computer is on and running iTunes
You would need to add more music to iTunes in order to access more via ATV
Currently Being ModeratedFeb 8, 2013 12:13 AM (in response to susiefromcamden)
Yes your apple TV only plays music you own as vazandrew says either from home share library on your Mac or PC or via cloud with match. You can of course used something like you tube which has some music videos.