A mandolin is a string instrument - a member of the lute family - which is plucked or strummed like a guitar. The modern mandolin evolved in Naples, Italy. from the mandola, later, the mandolino, in the mid-18th century. There are several forms of mandolins including the Neapolitan style which has a bowl shape, the original shape of mandolins. The other forms include flat back style and guitar style. The mandolin has a sound board with sound holes, a flat fretboard and eight strings arranged as four pairs (courses). The tuning of this instrument is similar to a violin and is usually GDAE. Some electric mandolins only have four single strings instead of four courses. Apart from Western classical music, the mandolin has been used in bluegrass, country, jazz, rock music and Indian classical music.