[2] It was written by guitarist Jan Akkerman and based on an improvised instrumental that the group performed after the plug was pulled on a concert in Majorca in June 1970 because they played over their allotted time.

[5] The recording features group leader Thijs van Leer on flute, which has led to it being compared to the work of Jethro Tull.

[7] Focus almost disbanded during 1970, after the song was recorded, but because of the commercial potential for "House of the King", they were persuaded by management to stay together, albeit with a different line-up.

[9] The track's commercial potential led to it being used as the theme tune for the 1970s ITV television show Don't Ask Me (presented by Magnus Pyke).

[10] It was also used as theme for the Steve Coogan comedy series Saxondale, which befitted the title character's role as a former roadie for rock bands.