I Don't Know How to Love Him by Helen Reddy and Yvonne Elliman, since the 1950s when multi-version chartings were common. "I Don't Know How to Love Him" had originally been published with different lyrics in the autumn of 1967, the original title being "Kansas Morning". The melody's main theme has come under some scrutiny for being non-original, being compared to a theme from Mendelssohn's Violin Concerto in E Minor. In December 1969 and January 1970, when Andrew Lloyd Webber and Tim Rice completed "Jesus Christ Superstar", Rice wrote new lyrics to the tune of "Kansas Morning" to provide the solo number for the character of Mary
I Don't Know How to Love Him distinct Spanish-language renderings of "I Don't Know How to Love Him" were introduced onstage: firstly Julissa introduced "Yo no sé cómo amarlo" (lyricist Marcos Lizama) in the Teatro Ferrocarrilero Gudelio Morales (Cuauhtémoc) of "JCS", while Angela Carrasco introduced "Es más que amor" (lyricist Jaime Azpilicueta) in the Nuevo Teatro Alcalá (Madrid) production which opened 6 November 1975, with both Julissa and Carrasco heard with their respective renderings on their respective cast album releases: Julissa in 1974, Carrasco in 1977. Cast albums from subsequent Madrid productions featured Estíbaliz singing "Es más que amor" (1984) and Lorena Calero singing a new Spanish-language