Transferring documents?
Do you mean by using the File Sharing method? Then it's not quite the same thing.
The method I prefer is to import the music into iTunes using Add to Library in the Files menu. Once you do that go to the Music tab instead of the Apps tab. There you can choose to sync all your music, or selected songs by playlist, artist, album, or genre.
Alternately you can simply drag songs or albums from the song list to the iPad in the Devices list.
If you have a lot of music and want to sync playlists (like I do) the first method is the way to go.
If you only have a few songs and are satisfied with the generic sorting/listing in the Music app on the iPad, then the second will be enough.