4 words for DHOOOOS 1-letter words

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1 letter (4)

d h o s
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
IARA
Hint 3 another clue
Solo
6 +1