Same as Paula. Never ever used music finder. Only use registrations. Some 8 buttons to one song and some 8 buttons covering one general style say, 60's Pop which can be used for various numbers. Furthermore, I hardly use any Yamaha on-board styles. Most of the styles I use are imported, many from the PSR Forum. I never use the OTS. All my voices are built into the registrations.
Overall, I have about 250 useful registrations (8 buttons each).
Vic