Thomas Francis "Tommy" Dorsey, Jr. (November 19, 1905 – November 26, 1956) was an American jazz trombonist, trumpeter, composer, and bandleader of the Big Band era. He was known as "The Sentimental Gentleman of Swing", due to his smooth-toned trombone playing. He was the younger brother of bandleader Jimmy Dorsey. After Dorsey broke with his brother in the mid-1930s, he led an extremely popular and highly successful band from the late 1930s into the 1950s. He remains a famous big bandleader of the swing era into the twenty first century.