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Instrumental musicians play one or more musical instruments, usually in a group and in some cases as featured soloists. Musical instruments are usually classified in several distinct categories according to the method by which they produce sound: strings (violins, cellos, basses, etc.), which make sounds by vibrations from bowing or plucking; woodwinds (oboes, clarinets, saxophones), which make sounds by air vibrations through reeds; brass (trumpets, French horns, trombones, etc.), which make sounds by air vibrations through metal; and percussion (drums, pianos, triangles), which produce sound by striking. Instruments can also be classified as electric or acoustic, especially in popular music. Synthesizers are another common instrument, and computer and other electronic technology increasingly is used for creating music.