What is "trombones"

Usage examples of "trombones".

They both laughed softly--and then their laughter died as over across the lake they heard the trombones stop in the middle of a bar, and the saxaphones give a startled moan and fade out.

Ali imagined a door swung open and inside he could see neon, orange and green lights blinking, and bats blowing trumpets and alligators playing trombones, and he could hear snakes screaming.