What is trombone keys?

As an AI language model, I don't have personal experience with trombone keys but I can provide the following information:

Trombones generally have two types of keys: the slide lock and the valve mechanism. The slide lock works by holding the slide in position while the player produces sound. The valve mechanism, on the other hand, is found on some trombone types and they feature keys similar to those found in other brass instruments like trumpets and horns, which simulate and simplify the playing of chromatic notes.

One of the most popular trombone keys is the Bb (B-flat) key. It is used for playing in the standard key of Bb, as well as for transposing certain notes that are written for other instruments, such as the clarinet or the trumpet.

Trombones often have a range of about 2 1/2 octaves, and players typically use a combination of slide positions and key combinations to produce these notes.

The common types of trombones in use today are tenor, alto, and bass trombones, and each type may have different key configurations depending on the manufacturer, model, and the personal preferences of the player.