Drum throne = drum chair.

Ah so that’s what those round cushy seats drummers sit in are officially called - drum thrones. I never knew. For round spinny things you would think they would be highly uncomfortable.

But even for a person with a big butt like I, those chairs support just enough to not kill your back. But because they spin they allow for easy movement to the rest of the drum kit. I know; I used to spin in my uncle’s drum throne all the time when he had his drum kit years ago.