indeed. are those de-tuners on the bass?
I believe that's a low C extension with mechanical "fingers" to play notes up to where the open E would be.
that was great! ... lively, expressive, big full sound and totally unplugged - wonderful.
That venue looks like it could be an art gallery of some sort--I love art gallery performances. One of my favorite musical experiences was seeing ROVA saxophone quartet at the Dali museum in St. Pertersburg...mezmerizing.
Fun stuff, here: THERESA ANDERSSON