I'm looking for a word to nicely describe how a cello sounds, and I think that an opposite of wailing might be a good description.
The definition for wail describes a high-pitched tone:
1 A prolonged high-pitched cry of pain, grief, or anger.
So what would be the word for the same description, except it's a bass (or just low-pitched) tone?
The purpose is preparing subtitles for a music video which has cello playing, so it would be something like:
(But I want to replace "playing" with the cello sound word, in verb form)