Below is a bit of P.Oxy.2076. Full image of that papyrus here.
I read it as:
The first two lines read
Σαπφο[ῦς] Β, i.e. "Sappho [book] 2", but the third line? What could that be saying?
I just realized I hadn't written that, in the above transcription, I distinguish between a single underdot (like under the T), which means a somewhat doubtful letter, and a double underdot (like under the I), which means a letter so doubtful that the given suggestion is just a guess, because e.g. it is only partially present and the rest could lead to many different letters.