Crossword Puzzle Duet number?

Clue: Duet number?

Duet number (TWO with 3 letters)
Best-selling number? (ONE with 3 letters)
Like some numbers and beef (CUBED with 5 letters)
Cubs' number (NINE with 4 letters)
-- number (speed ratio) (MACH with 4 letters)
It contains many numbers (LITTLEBLACKBOOK with 15 letters)
"Lucky" numbers, in France (SEPTS with 5 letters)
Oft-played numbers (HITS with 4 letters)
Record number, maybe (OLDIE with 5 letters)
Jazz legend who recorded "Porgy & Bess" as a duet album with Ray Charles (CLEOLAINE with 9 letters)