Number of weeks spent as #1: 4

Waylon and Willie teamed up again in 1978 for an album of duets called “Waylon & Willie,” which featured the song “Mammas Don’t Let Your Babies Grow Up to Be Cowboys.” An example of the emerging “outlaw country” sub-genre, “Mammas” was originally recorded two years earlier by Ed Bruce on a version that peaked at #15 on the Hot Country charts. It was also covered by The Chipmunks.

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