The guitar is the song.

MLA

Gascoigne, Brian and John Williams. The guitar is the song. [Place of publication not identified] : Sony Classical, [20--?]

APA

Gascoigne, B. & Williams, J. (2000). The guitar is the song. [Place of publication not identified] : Sony Classical.

Chicago

Gascoigne, Brian and John Williams. The guitar is the song. [Place of publication not identified] : Sony Classical, [20--?]