Performances combining music and drama were popular in Hellenistic times; see P.Wilson, in "Greek and Roman Actors", page 63 ( Google Books ). There is a French translation of inscription B, with comments and photographs, by Claire Tuan.
[A] {inside a laurel wreath} The people of Delos crowns Satyros of Samos, the son of Eumenes.
[B] Satyros of Samos, the son of Eumenes: he happened to be the first the play the flute in the contest without opponents, and he was chosen to offer to the god and the Greeks, at the sacrifice in the Pythian stadium after the gymnastic contest, a song - "Dionysos" - with choral dancing and a cithara piece from the "Bacchae" of Euripides.
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