I've been singing on a karaoke app recently and I wanted to comment on a person's voice. How would I go about saying "You sound like a rockstar!"
I was thinking 「Aさん、ロックスターみたいなぁ～」
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We have a post there How to express “X sounds like Y”, which, however, not very useful for your case.
This is actually very very close, but no cigar. I'd say:
As you may know, it is most natural not to translate "sound" as is. Best using みたい whenever it is "sound" or "look" or "smell" or such.
But you can specify the origin of sensation, too. In this case, "sound" has no call either, because we would go one more step finer.
Aさん、声がロックスターみたい！ (quality of voice)
Aさん、うますぎてロックスターみたい！ (good singer)
Of course you can elongate the ending a bit, like how you put ～ at the end.