Winning Matrix: a selection of tunes for trumpet, baritone and euphonium, by Peter Lawrance. Grade: Medium. Another great collection in a wide variety of styles ranging from the Classical repertoire to Jazz. Players of all ages will find something to enjoy practicing and performing. The titles in Winning Matrix have been arranged as unaccompanied solos but combined with these easy piano accompaniments they offer an even greater opportunity to explore the wide variety of styles available.