Walk Hard: The Dewey Cox Story is a 2007 American music comedy film written and produced by Judd Apatow and Jake Kasdan, directed by Kasdan and starring John C. Reilly. The plot echoes the storyline of 2005's Johnny Cash biopic Walk the Line and 2004's Ray Charles biopic Ray; Walk Hard is also a parody of the biopic genre as a whole. Wikipedia
(trying to write/sing a song playing a harp) Dewey Cox: I had it all... I had it all... and then I fucked up!