Seal is a songwriter.
`` Crazy '' is a song written by English soul artist Seal and Guy Sigsworth . Killer (Adamski song) . Written by Adamski and Seal and produced by Adamski , `` Killer '' was Adamski 's breakthrough single , but is now more notable for featuring Seal as a vocalist . Seal Henry Olusegun Olumide Adeola Samuel ( born 19 February 1963 ) , better known by his stage name Seal , is an English singer and songwriter . As a songwriter , he received the British Academy 's Ivor Novello Award , for Best Song Musically and Lyrically , in consecutive years for `` Killer '' ( 1990 ) and `` Crazy '' ( 1991 ) .