The trombone is a musical instrument in the brass family. Unlike other brass instruments, the trombone is played without the use of valves or keys. Instead, the player uses a slide to change the length of the instrument, which in turn changes the pitch. The valve trombone is considered one of the most versatile instruments in the orchestra, and it is often used in jazz bands and brass quintets. The unique sound of the trombone can add depth and richness to any piece of jazz music.