A" looks good enough to me. It's a title, you can omit "a" or "the" as you like, can't you? You may do as you like if you are naming the song youself, but it is still not natural English.
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mitsuwao23But as a title "Song for U.S.A" looks good enough to me. It's a title, you can omit "a" or "the" as you like, can't you?You may do as you like if you are naming the song youself, but it is still not natural English.