The harmonica is sometimes called a mouth organ, mouth harp or blues harp. The harmonica is a free reed wind instrument invented in the 1820s, in Germany, which is played by blowing air into it or by drawing air out. You place your lips over individual holes (reed chambers) or multiple holes to create harmonies. The harmonica was popular with many 50’s, 60’s and 70’s blues players and singers. Bob Dylan also played his harmonica to add a touch of blues to his folk and rock sound during this time period.