Sagbuts are musical instruments, like a kind of horn.
Sagbuts are often used in old music, like from a long time ago.
Examples:
The musicians played the sagbuts in the concert.
The sagbuts make a loud sound.
I saw the sagbuts in the music store.
The sagbuts look like long, twisty horns.
The sagbuts sound like elephants trumpeting.
The sagbuts are as long as a tall person.