Musical pieces are compositions created for performance, often involving instruments or voices. They can vary in length, style, and complexity, ranging from simple melodies to intricate symphonies. Common forms include sonatas, concertos, and chamber music, each with its own structure and purpose. These works are typically written using musical notation, allowing musicians to interpret and perform them. Famous composers like Ludwig van Beethoven and Wolfgang Amadeus Mozart have contributed significantly to the repertoire of musical pieces, influencing generations of musicians and listeners alike.