The piano has been a very popular instrument ever since the mid 18th century when it soon replaced the clavichord and the harpsichord. By the early 19th century the sound that the piano made was big enough to fill large concert halls. Smaller pianos were made for use in people’s homes. At first these included square pianos and giraffe pianos, later on the upright pianos became popular for home use. Pianos are not often used in orchestras (if they are, they are part of the percussion section). They may, however, be used for piano concertos (pieces for solo pianist accompanied by orchestra). There is a vast amount of music written for piano solo. The piano can also be used together with other instruments, in jazz groups, and for accompanying singing.