Michael "Jakko" Jakszyk (born Michael Lee Curran) is an English musician, record producer, and actor. He has released solo albums as a singer, songwriter, and multi-instrumentalist and has been the lead singer for King Crimson since 2013. In 1986, Jakko released the single "Judy Get Down"/"This Old Man." The A-side featured an uncredited performance by Davy Jones on backing vocals. Davy was listed as "Mystery Guest Star" in the musician notes on the rear side of the single's picture sleeve. Dave Stewart of The Eurythmics collaborated with Jakko in the '80s, and he also contributed to "Judy Get Down."
I first heard this song in 1987 on a mixtape that I received from Jodi who was the co-president of the Monkees/Boyce & Hart Photo Fan Club, of which I was a member from 1986 to 1991 or so. You can see the track listing below. I thought I was swimming in riches with the material included on this tape! I recall "Judy Get Down" being a particular favorite.
Side A featured the songs from the bootleg Davy & His Band: Ninth Album, while Side B included solo material from Micky, Davy, and Peter in the '80s. I still have that tape!
"Judy Get Down" is available for download on iTunes, but the audio file above is an MP3 of the song that I received from a fellow fan some years ago. The 12" single version featured an extended mix with Davy's vocals playing a prominent role: