Written by Tony Hiller, Lee Sheriden and Martin Lee and produced by Hiller, it was the band's second UK number one single (after their Eurovision winner, Save Your Kisses for Me the previous year), spending a single week at the top in August 1977. The song remained on the UK Chart for 12 weeks - 10 of them in the Top Ten - and was the 9th biggest selling single of the year. It was awarded a gold disc in August 1977 by the BPI. The song also was a number one hit in Ireland, Japan and South Africa (for two weeks). It featured on the group's album Images, which was released later in the year.

Despite being one of the biggest selling singles of the decade, the song has often been criticised in its similarity to "Fernando" - an earlier single released by pop group ABBA, who were seen as Brotherhood of Man's main competition in the UK. Member and co-writer Sheriden denies any attempts to 'copy', stating that they "were simply writing in the style of the day". Other male member and co-writer, Lee also denies the allegation, but admits that "they were pretty close".

The song tells of a shepherd in Mexico who falls in love with a rich girl, but he is met with resistance from her family. Both aware that her family would never allow the union, they run away together and commit suicide. According to co-writer Hiller, the lyrics were based on "Romeo and Juliet - the great love story. The idea was to create a modern day Romeo and Juliet romance". The song is a moderate 117 beats per minute, and played in C Minor with the vocal range: G3-C5.

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