Riddle of the day:  two figures are needed to make this one. But they're both important for counting the song

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Who was the first musical composer?

Which scientist listed below is not one of those to advance the study of mathematics? a. euclid b. herodotus c. pythagoras d. archimedes