Asked during a radio interview to name the song that meant most to the couple when they were falling in love, Mr Cameron named Perfect Circle from R.E.M's 1983 debut album Murmur.
He said: "We had lots of songs. There was one by R.E.M,which was Perfect Circle, which we liked a lot.
"In June, we will have been married 18 years. I remember it all as clear as day."
Mr Cameron picked the track when he appeared on Radio 4's Desert Island Discs in 2006, saying then it "reminds me of driving down to Bristol to Sam's student flat and falling in love".