Here’s the tune from Monday 5th’s session, Ladies’ Breast Knot. It seems to be a widespread tune, with versions found across England, Scotland and North America. There are various versions dating back to the mid-1700s, making it a country dance tune and not a polka (oops!).
Here’s a demo of the tune, a slow version and a faster version, with the dots below.
Here’s a PDF of the chords, mine and the ones printed in the fantastic Dave Townsend’s English Dance Tunes book:
Challenges were adding some connecting notes in places where there is a gap of a third (so G to B for instance) and adding turns in places where the melody moves down by step or by small jump, for instance on the F# in bar 4.