All of the music on my iPad was ripped from CDs to iTunes on my Mac, then synched to the iPad's Music app. Nothing bought from Apple, no USB involved, though music on a thumb drive could be ripped to iTunes as easily as from a CD. Since all my music is from albums, I generally had to edit the metadata to make it appear correctly, as iTunes is not very smart. One reason I do it this way: right now I'm streaming a CD from my iMac to my hifi via Apple TV, and iTunes works well enough using the Remote app on the iPad; thus, the music was already in iTunes, just a short step from synching with the tablet,