[BRX]

Nope, read itsme's post again. The csv import *is* for getting new songs/PDF into MSP with your metadata from a spreadsheet. You have to adjust your format of course and you have to put some effort in it (believe me I know; i've spent hours to hone my library) but I'm pretty sure it's what you are looking for. It's a kind of batch import.

It's the other way round: It's not possible (or at least not in a convienient way) to populate existing songs in MSP with metadata from an external spreadsheet.