The Vibraphone is the most mechanically complex and sophisticated of all mallet instruments with a key range of 3 ½ octaves. Its tube resonators and the adjustable electric motor result in a “vibrating” (crescending and decrescending) soft metal sound that takes its inspiration from the human voice. The vibraphone is not only firm favorite in jazz but also in contemporary music, both as a harmonic and melodic instrument. The instrument was played not only with soft, medium and hard mallets, but also with a string bow.