Default Google Play Music won't sign in / sync

Please help me.

When i install Google Play Music, it's stuck on the "select an account" screen.
In the google account sync options, Play music is not listed as one of the things i can sync through my account.

I've factory reset my device around ten times and tried all kinds of combinations of installing music before the play store, installing all other google apps first, etc.

1gb/8gb/2100 model, latest firmware, not root/custom roms