4 words for XY 1–2 letters

Filter answers for the "xy" by length:
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Alphabet (Z–A)
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1 letter (2)

x y
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Alphabet (A–Z)
Alphabet (Z–A)
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2 letters (2)

xy yx
E.g. Puccini’s Che gelida manina
?
A
?
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
AIAR
Hint 3 another clue
Solo
27 +2