My quest for and research into bands that have performed and/or recorded the music of Frank Zappa has turned up quite a number of gems the last couple of decades.
The Magic Mushroom Band is an unfortunate exception.
"Live '89" is a recording of a 1989 concert where the band performed 50 seconds of Zappa's 'What's The Ugliest Part Of Your Body?'
It's the second track on the CD, the first one being 'Burning Like The Sun', and I haven't even listened to the rest.
Out of tune.
Stay away from this one.