Dear Mr. Fantasy

"Dear Mr. Fantasy" is a rock song by Traffic from their 1967 album, Mr. Fantasy. Jim Capaldi contributed the lyrics, while Steve Winwood and Chris Wood composed the music.
In a song review for AllMusic, Lindsay Planer writes:
Dave Matthews mentioned this song specifically as part of his speech inducting Traffic into the Rock and Roll Hall of Fame, and this is the song they played as part of that same induction.

Renditions

Traffic recorded an extended version for their live album Welcome to the Canteen. Winwood played the song at Eric Clapton's 2007 Crossroads Guitar Festival and the song appears on the festival DVD. Winwood and Clapton played the song on their joint tour; a live recording appears on the album Live from [Madison Square Garden (Eric Clapton and Steve Winwood album)|Live from Madison Square Garden]. Planer also notes performances by Mike Bloomfield and Al Kooper ; the Grateful Dead, and Crosby, Stills, & Nash. Canadian rock band Big Sugar recorded a version of the song which was first released on their 1995 EP, Dear M.F., and which was later included on their greatest hits compilation, Hit & Run in 2003.