Knud Grabow Christensen (born 19 December 1949),[2] better known by his stage name Sebastian, is a Danish singer, guitarist and songwriter.

Sebastian began his career in the end of the 1960s, where he traveled about with a bus for amateur competitions, arranged by a businessman for small concerts in Denmark.

His first Danish song was Lossepladsen bløder (partly inspired by Bob Dylan's "Desolation Row" from the album Highway 61 Revisited),[6][7] which was released as a maxi single that year.

Sebastian's major commercial breakthrough in the music industry came when his first Danish-language LP Den store flugt was released on 17 October 1972,[8] which was praised as a "Donovan-like Dylan" among other things in the reviews back then.

[9][10] Den store flugt has had extensive sales that are problematic to certify, but estimated to be 100,000 to 170,000 copies by music critic and journalist Torben Bille, in cooperation with Sebastian.

Although, Sebastian's musical style was gradually expanded since the end of the 1970s, with refined use of a synthesizer (often played by Kenneth Knudsen)[14] among other things.

In 1979, he recorded his own music to texts of Bertolt Brecht on the album Tiderne skifter, which was released in March 1979, got positive reviews and has sold approximately 100,000 copies.

[15][16] He recorded music to texts of Bertolt Brecht again in 1988 with the play named The Good Person of Szechwan (Danish: Det gode menneske fra Sezuan).

In 2019, he received "Polka Verner Legat", which was founded by Søs Egelind and Kirsten Lehfeldt in 2002, and is granted annually at Smukfest to a distinct Danish cultural person.