Maria Joao Pires just might be the Brett Favre of pianists. She told one newspaper she would stop playing in 2011. Then she said she had no intention to retire at all. Now she's thinking maybe in 2014. Free agent Maria Joao Pires signed on with David Zinman and the Zurich Tonhalle Orchestra for a concert at the Super Bowl of summer music festivals, the BBC Proms in London. She'll play Mozart's Piano Concerto No. 27.