I am looking for a single word, most likely an adjective, to describe a voice like Dolly Parton's voice in the song Go Tell It On the Mountains. The first adjective that comes to my mind is "sheepish" but this has a negative connotation. Maybe vibrating? Does anyone have a better word choice?
Example sentence: The [sheepish] voice of the singer seduced the audience.
Again, I am looking for a word that does not have a negative connotation to describe a singer's voice similar to Dolly Parton's in the song.