What is That? is a full-bore, hard-driving, rock chart with a very funky, yet melodic melody. Composed as a 16-bar blues in F with plenty of space available for any or all soloists, it also features a powerful shout chorus and an open drum solo near the end. An optional flute part is included and the written ranges are: Trumpet 1 to A; Trombone 1 to F; Alto Sax to D. Highly recommended!