Fritz Heinrich Klein (2 February 1892 in Budapest – 12 July 1977 in Linz) was an Austrian composer. He was a student of Alban Berg and the inventor of the all-interval row. Klein's twelve-tone theories appear to originate independently of Schoenberg's as with Josef Matthias Hauer's, and these claims as well as frequent stylistic changes helped to exclude him from the Second Viennese School, though Klein's theories where highly influential on Alban Berg. Read more on Last.fm