Instruments of the Orchestra18 Groups of Instruments how they are played; how they work; their historical development; their repertoire. The Flute * The Oboe * The Clarinet * The Bassoon * The Horn * The Trumpet * The Trombone * The Tuba * The Saxophone * The Harp * Keyboard Instruments * Timpani * Percussion * The Violin * The Viola * The Cello * The Double Bass * The Voice