Yesterday I had been working on a tune in the Key of D with my fifth string peg at the 7th fret. Today when I picked up my banjo to work on the B part to Old Joe Clark I started noodling over the F Chord not realising the fifth string was still hooked. I could tell something didn’t sound quite right but none the less it sounded quite pleasing to the ear. It took me a short while to figure out the problem.
Then I got to thinking could there be an instance / tune in the Key of F where one might capo the 5th string in this way @BanjoBen ?