Compléter String instrumentsVersion en ligne Form groups of three and fill in the gaps to complete the sentences about the string musical instruments. par Laura Erra Torras 1 plucking musical vibrating cello bowed bow played percuted hitting guitar String instruments are instruments that produce sound from the strings . All these instruments could be classified according to the way of playing them : The string instruments are most often by drawing a across the strings . In this group we can find : violin , viola , and double - bass . A string instrument is an instrument that sounds because you play by the strings . The piano is the most common instrument in this group . Plucked string instruments are played by the strings . Harp and are the most representative instruments in this group .