Is there any good or authentic phrase to compliment one singing well or play the guitar well?
not the ordinary compliments but more different

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-	Don’t forget me when you make it big.
-	Are you a signed artist?
-	Are you a professional musician?
-	You brought the house down.
-	Your music touched me deeply.
-	Your music moved me.
-	Thank you for being the artist that you are.
-	Wow, your voice was so ethereal/haunting/piercing/hypnotic/regal/soulful.

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"Your singing is so melodic and beautiful"

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"Wow you're so good!", "You're amazing!", "You're so talented!" are just some of many more