Bassist/vocalist Troy Sanders talked about the distribution of vocal parts in Mastodon, explaining to Full Metal Jackie:
"One of the beauties of Mastodon is that we have a three-way vocal tag team.
"It's created very selflessly, meaning if I write a certain set of lyrics, but Brent [Hinds]' voice fits better on the part, then Brent will take those lyrics and that's his part.
"A lot of time Brann [Dailor] will write lyrics for something but the voice that calls for it is my voice, then I will take it. It's very interchangeable as to who writes what and who performs what. That's a great quality to have as opposed to, 'Hey, I wrote it, so I'm singing it.' That doesn't fly and ultimately we all want the greater good of the song no matter who performs it.
The musician continued: "We have three distinct voices, so we kind of let the music dictate on who fits where.
"If it's got this '70s, very airy bridge to it - that's going to be our drummer Brann's voice. If something is in the line of a gruff Melvins approach or something, that would be me.
"So we just kind of put the placement of people and our voices where we feel like it belongs. That's a really cool thing that we have."
As an example of the boys doing their singing thing, you can check out "Sultan's Curse," the lead single off new album "Emperor of Sand." It's Troy during verses, Brent in the chorus, and Brann in the bridge.