The playlist feature on the G70 is NOT a 'songbook'. It's a jukebox for unattended playback of SMF's.

The Music Finder is more what you need. Simply use the sub-headings in it to organize lists. Alternatively, using a computer, it is possible to create UPS's very quickly using the Session Manager software (drag and drop), and use the UPS as a sort of Gig Disk. There's no limit to how many UPS's you can have (I think) and they load very quickly.