That is such a fun “rattlesnake” on the guitar! I wonder how to make one. I have attached a bell to weigh down the neck of a homemade instrument too however it never would seem to produce any recognizable rhythm.
I saw this today too—Sally in the Garden, a traditional tune, by Laurel Premo & Anna Gustavsson. They are playing gourd banjo and nyckelharpa respectively—two instruments I never expected to hear in a room together, and it sounds amazing.