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](https://www.lexico.com/definition/wail) for *wail* describes a high-pitched tone:

> 
> **Wail**
> 
> 
> **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](https://youtu.be/hdYV8Xw87hs) which has cello playing, so it would be something like:

```
[Cello playing]

```

(But I want to replace "playing" with the cello sound word, in verb form)