If I’m talking about someone’s voice is raspyness or raspy-ness correct?
The raspyness of Cobain’s voice adds another layer of complexity to the song.
The raspy-ness of Cobain’s voice adds another layer of complexity to the song.
Spelling checker doesn’t like raspyness, but raspy-ness doesn’t look quite right.
The proper term you’re looking for is raspiness. Definitely not raspy-ness, neither raspyness, nor raspi-ness. The Wiktionary lists it, even with quotations backing it up:
The speaking voice was clear and strong with no raspiness, but there was a noticeable rasp in the loud singing voice.
~ 1978, Mavis Douglas, Vocal problems of the young singer