his death at 96 on Friday.“Tony Bennett was one of the most important interpreters of American popular song during the mid to late 20th century,” Joel, 74, told The Post in a statement.“He championed songwriters who might otherwise have remained unknown to many millions of music fans.”Joel noted that Bennett was a vaunted vocalist whose talent transcended generations and genres.“He was a unique talent that made the transition from the era of jazz into the age of pop,” he said.“I will always be grateful for his outstanding contribution to the art of contemporary music.”Joel collaborated with Bennett on the “I Left My Heart in San Francisco” singer’s 2001 LP “Playin’ With My Friends: Bennett Sings the Blues,” which won a Grammy for Best Traditional Pop Vocal Album.“He was a joy to work with,” said Joel.