Bob Dylan is particularly famous for doing this. It’s not uncommon to adapt everything from nursery rhymes to full-blown songs. Here’s where Dylan got the inspiration for “Don’t Think Twice It’s Alright”:
“FEFE”: Welp, almost none of the section lengths here are standard. The bridge is really like some kind of early outro that incorporates the refrain, and then the outro-outro also mixes in the refrain, just in a different way. Who even knows anymore?