Here’s a page listing some musical guest appearance documented on the web. Currently there ain’t much that’s been documented, and less of that that’s posted, but as I go through my archives I’ll dig up more.

With Daniel Sonenberg:

Dan’s a very old and dear friend and major force early in my music education, currently a successful opera composer, music professor at University of Southern Maine, and still playing rock & roll. I’ve contributed small bits to his rock and classical compositions twice.

1. It Doesn’t Matter To Me (feat. Michael Kupietz & John Kapsis)

   Dan Sonenberg – Words & Music, Jon Kapsis – organ & clavinet, Michael Kupietz – lead guitar, Matt Schickele – backing vocals

2. Radiohead Song

   Dan Sonenberg – music, Michael Kupietz – text

   This was a facebook request by Dan for intense emotional memories involving music. Not knowing what was to come, I responded with a short paragraph about perhaps my personally darkest private moment ever, which happened to come during a listening of Radiohead’s “Ok Computer” and had resulted in me not listening to that album again for about 5 years. Dan set it to avant-garde classical piano music as part of a suite he called Detuned Radio: Ecstatic Reminiscence and Arguments about Music and had an operatic soprano sing it the world.
   

   Dan Sonenberg · Radiohead Song