What noted playwright wrote as a music critic using the pseudonym Corno di Bassetto?

That was George Bernard Shaw

Future Nobel Prize winner Shaw felt his name (at the time) didn't mean much, so he wrote some very funny (and good) critiques of music under the di Bassetto name. Nice job, Jenny !
(But, like SR, you could let the ink dry, too. Maybe next time, I will just think of the question, and you can email me the answer! Think of the server space KK will save!)

For those interested in this sort of thing, a 'corno di bassetto' is a tenor clarinet.