To repeat myself, it was a lot of fun to hear different people’s takes on the same material. Casey’s version of “The Robot Song”, also appearing on Wanger, was utterly different from Not R’s, aside from having the same lyrics by jwgh. I’m not sure which I like better.
Some years later Charlie was involved in a stage play called Barflies and a sequel called Barflies: A Second Shot, and live performances of several IBC songs were incorporated as incidental music. On the wiki you can find the Barflies version of Casey’s arrangement. Here’s Casey’s original.