Does anyone know if there exists a piece for the prepared double bass in which there are two (or more) performers playing a single instrument? I've tried google and came up with no results. However, I believe someone out there has to be brave enough (I mean this in a good way) to write such a thing.
The Julio Estrada solo calls for two basses with the performer laying down between them: This one is for no hands:
My ex and I used to play "Lucky Southern" on one bass-she had the E and A strings for bass comping, and I had D and G for melody and soloing.