A Minstrel (unnamed) strums his lute in the Outer City Marketplace, by the fountain, during the daytime. Drop five ducats in his basket, and he'll sing a small tip about living in Venice. He has several short songs to sing before he repeats himself (none of them say anything you can't learn through other means.)
"Health is in red,
Mental's in blue,
Half of this city,
Is out to kill you."
— (not one of his rhymes, but should be.)