1. Piano: The piano is a versatile and prominent keyed instrument in the orchestra. It serves as a solo instrument, accompanies other instruments, and can also be used for orchestral effects.
2. Harpsichord: The harpsichord is a historical keyboard instrument that was widely used in Baroque music. It produces sound by plucking strings with quills or plectra.
3. Organ: The organ is a majestic keyboard instrument that is known for its rich and powerful sound. It is often used in religious music and can be found in churches, concert halls, and other large venues.
4. Celesta: The celesta is a small keyboard instrument that produces a soft, bell-like sound. It is often used to add a delicate and ethereal touch to orchestral arrangements.
5. Electric Piano: The electric piano is a modern keyboard instrument that produces sound through electronic means. It can imitate the sound of traditional pianos or offer unique timbres.