2 words for DD 1–2 letters

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1 letter (1)

d
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2 letters (1)

dd
E.g. Puccini’s Che gelida manina
?
A
?
R
?
I
?
A
Hint 1 meaning
An air or song; a melody; a tune.
Hint 2 anagram
RIAA
Hint 3 another clue
Solo
24 +2