import music from my ipad

i just re-installed my mbp, and have deleted whole disk. i think my music is safe because i had sync it to my ipad.

but after installation done, i can't get my music from my ipad. in iTunes, when i try to click sync music, it showing me an alert that iTunes will remove all music from my ipad.

i know i can sync with auto download purchase items. but i got this music not from itunes stores. i got it by copied from my band studio, ( and some just copied from cd)

do you know how to get the music sync back to the mac without delete from ipad?