Umberto Petrin  Umberto Petrin (born 1960) is an Italian jazz pianist, composer and poet. Petrin began studying piano in the early 1970s and started playing jazz more than a decade after that. He joined the Italian Instabile Orchestra in 1997. Petrin has published two poetry collections – "Perimetri" and "Miles". An asterisk (*) indicates that the year is that of release.