Madeline Bell, Sue & Sunny – backing vocals Technical Mixed by Giorgio Moroder Engineered by Jürgen Koppers Album Cover Concept by Susan Munao, Joyce Bogart & Donna Summer Design by Henry Vizcarra & Gribbitt! Art Direction by Gribbitt! & Chris Whorf Photography – Mario Casilli Charts Weekly charts Year-end charts Certifications and sales References 1976 albums Donna Summer albums Albums produced by Giorgio Moroder Albums produced by Pete Bellotte Casablanca Records albums Concept albums