People refer to that as “timbre” and can describe several different specific qualities of a voice. It can be smooth, rough, thin, full, etc. It is extremely subjective as to whether you like a singer’s tonal qualities.
For example I really can’t stand Carrie Underwood’s voice as I think it has a shrill quality that I can’t quite describe, but millions of other people absolutely love her voice which is totally fine. For a kpop example my favorite vocalist is probably Wendy from RV, she has an extremely smooth and slightly smoky, powerful voice but I would totally understand if someone else didn’t really like her so much.
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