3 words for DU 1–2 letters

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1 letter (2)

d u
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2 letters (1)

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