Sackbuts are a kind of musical instrument, like a horn.
Sackbuts are often used in old music and can sound very nice.
Examples:
The musician played the sackbuts in the concert.
I like the sound of the sackbuts.
The sackbuts are big and shiny.
The sackbuts look like long, twisty tubes.
The sackbuts make a loud, deep noise.
The sackbuts are fun to play.