i found this anegdote about Chopin :
Chopin Broccoli?
Frederic Chopin was often invited to dinner by Parisian hostesses who then imposed upon him to perform (for free). Asked to play by a particularly pushy hostess one evening, Chopin declined. “But, madame,” he explained, “I have eaten so little!”
and its from http://www.anecdotage.com/index.php?aid=1115
