I added some music from my brothers computer, and just recently got a new one if I connect my phone to iTunes and upload the music I have on there will it erase the music I uploaded on my brothers?
Most Helpful Girl
iTunes won't necessarily automatically erase music you already have on your phone. Go to edit>preferences>devices, and check the 'prevent iphones, ipods, and ipads from syncing automatically'. You can't add any new music to it unless you re-sync it, though.
iPhones can only be linked with one iTunes account so best just transfer the music you added from you brother's computer to the computer you normally use with your phone and combine the music librarys in a sense.0