Jan Johansson (16 September 1931 – 9 November 1968) was a Swedish jazz pianist. His album Jazz på svenska (Jazz in Swedish) is the best selling jazz release ever in Sweden; it has sold over a quarter of a million copies and has been streamed more than 50 million times on Spotify. He was the father of former HammerFall drummer Anders Johansson and Stratovarius keyboardist Jens Johansson, who run Heptagon Records which keeps their father's recordings available.

Source: Wikipedia (https://en.wikipedia.org/wiki/Jan_Johansson_(jazz_musician))