Saturday Night Clyde gave a weekly preview on the events that took place that year in Glasgow European Capital of Culture.
This episode was presented from the Glasgow May Festival. It featured the exposition 'Glasgow's Glasgow', an interview with Scottish poet Edwin Morgan, and music by John Martyn.
My best guess is that the John part was recorded at Buster Brown's club in Edinburgh, 16 March 1990. The info about this occasion reads "Sweet Little Mystery | Look At The Girl | Send Me One Line | Interview".