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"Luck Be a Lady" is a song written and composed by Frank Loesser in 1950 and first performed by Robert Alda. The song was featured in the musical Guys and Dolls . The lyrics relates the expected etiquette that a lady will stay with the gentleman who escorts her and not wander. [1] The gambler, Sky Masterson, hopes that he will win a bet if luck is truly a lady who is by his side, the outcome of which will decide whether or not he is able to save his relationship with the girl of his dreams.