The crwth is is an archaic stringed musical instrument, associated particularly with Welsh music, although once widely-played in Europe.
Hans Sebald Beham was an engraver who lived in the 16th century.
Beham was run out of Nuremberg twice for heresy, blasphemy, lack of respect for authority and plagarism.
Awesome. I just love his work. Can't figure out what's going on with Hercules' cape in this one though.