In a Songfacts interview with Pete Brown
, he explained that The Graham Bond Organisation, an influential group that Jack Bruce and Ginger Baker were in before forming Cream, was the inspiration for the lyric, which tells a tale of settlers heading into the desert. Said Brown: "The Graham Bond Organisation were like a mixture between pioneers and outlaws, and when Jack played me the music for 'Theme For An Imaginary Western' it reminded me of a Western movie. I'm a big Western fan, you know. I collect them, and it reminded me of some of the great Western scores by Dimitri Tiomkin and people like that, which I love. So, it reminded me of that.
So, I got the Western thing but then, I thought, 'No, this is not about cowboys, it's about Graham Bond and the Graham Bond Organisation.' That's the way it ended up. I still sing it quite a lot. When I'm doing gigs, I always include it."