This song was written by Mick Box and David Byron. The lyrics, which are presumably fantasy-based, are about a young man who falls in love with a gypsy woman. But the woman's father, the leader of the gypsy tribe, does not approve of their relationship, and forces the man to leave. He keeps hoping that his love will make up her mind and come to him, and plans to go back to her father to fight him.
To differentiate themselves from other Rock bands at the time, Heep replaced the almost obligatory guitar solo with a wild organ solo in this song. The song was one of the heaviest of its time, quickly became one of Heep's most loved songs and is now considered to be one of the most important early heavy metal compositions.
As confirmed in Sweden Rock magazine #15, David Byron can be heard playing percussion on teacups is this song.
David Bowie's "Space Oddity" tells the story of an astronaut who cuts off communication and floats into space. The BBC used it extensively in their coverage of the 1969 moon landing - an odd choice considering the lyrics.