A4 is spelled "Underground Walz" on both the rear cover and record label.
"Du fond d'une prison" is from the opening credits of Alain Payet's 'Nathalie rescapée de l'enfer' and "Atlantide Story" is (somewhat famously) from the opening credits of Jean Rollin's 'Le lac des morts vivants' . Multiple songs used in Jess Franco’s “Gemidos de Placer” .
