From the police blotter for Orange County, CA (Laguna Niguel):

A caller reported that his neighbor was screaming in his backyard about how Steve Martin can’t play the banjo. The incident occurred at 12:59 a.m. in the 28800 block of Placida Avenue.

From Steve Martin's Twitter account later that day:

Try being me. He forgot to add "Grammy Award winning…."

From the list of Grammy Award winners in 2010:

Best Bluegrass Album: Steve Martin, The Crow: New Songs for the 5-String Banjo

Normally I have the greatest respect for any opinion delivered by someone who's out screaming in his backyard at 12:59 a.m., but I think I will go with the Grammys on this one.