A mandolin (Italian: mandolino) is a musical instrument in the lute family (plucked, or strummed). It usually has four courses of doubled strings. The (usually) two strings in each course are tuned in unison. The courses are tuned in a succession of perfect fifths, and plucked with a plectrum (pick). It is the soprano member of a family that includes the mandola, octave mandolin, mandocello, and mandobass. It descends from the mandore.
Many classical composers composed works specifically for the Mandolin. Beethoven composed mandolin music and enjoyed playing the mandolin. The opera Don Giovanni by Mozart includes mandolin parts, including the accompaniment to the famous aria Deh vieni alla finestra. Also very well known are the mandolin concerti by Vivaldi. Gustav Mahler used the mandolin in his Symphony No. 7, Symphony No. 8 and Das Lied von der Erde. Some 20th-century classical composers also used the mandolin as their instrument of choice (amongst these are: Schoenberg, Webern, Stravinsky).