Janusz Grzywacz (born May 13, 1947 in Zakopane, Poland) - Polish pianist, organist, composer and producer. He graduated Polish philology at Warsaw University and attended Public Music School in Katowice. In 1970 with drummer Mieczysław Górka he set up experimental duo, which later was extendet to jazz-rock quartet called Laboratorium (Laboratory). The band existed until 1991. He is also composer of television and animated moovies' soundtracks.

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