Clue: We're told a letter and a number as well, a number in the 20s (3,3,3)
Answer: TEA FOR TWO
Explanation: Definition: a number in the 20s
Homophone of "T four too". The song is from the 1925 musical *No, No, Nanette*. Whenever this song is mentioned I always have to inlude a link to Art Tatum's amazing version