As summer winds down, the final act we've known for all these years coming to Nikon at Jones Beach Theater is the Dukes of September, who'll be there on Friday. Of course you don't recognize the band's name - but you do know the three '70s superstars who have joined forces to form the DOS. But how much do you really know about Donald Fagen, Michael McDonald and Boz Scaggs?

1. Who is the oldest of the trio?

A. Fagen

B. McDonald

C. Scaggs

2. What is Scaggs' real first name?

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A. Steven

B. William

C. Ricky

D. Bosley

3. Fagen's best-known group, Steely Dan, took its name from a sex toy mentioned in a work by what Beat Generation writer?

A. Jack Kerouac

B. Allen Ginsberg

C. Lawrence Ferlinghetti

D. William Burroughs

4. Name the one Doobie Brothers song on which McDonald sang lead that won a Grammy for Song of the Year.

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A. "What a Fool Believes"

B. "Takin' It to the Streets"

C. "It Keeps You Runnin'"

D. "Minute by Minute"

ANSWERS: 1-C (Scaggs is 66; Fagen, 62; McDonald, 58); 2-B;3-D; 4-A