I hadn't come across the Mozart Groove Lounge before so thank you Retro for filling that particular gap. The other two were released by Apollo Sound who I presume acquired the Mozart Edition library at some time? Though there is a separate website for Mozart Edition where I obtained two of their (different) compilations on CD a while back which I think I have shared before.
I find the ME music is very distinctive and very much reminiscent of the BBC test cards of the 60's. Swinging Spinet by Cliff Hammer (aka Hans Hammerschmid) is a particular favourite of mine and brings back memories of the black and white test card playing on the Ferranti TV my parents rented from Southern Rentals in Brighton. Meanwhile, back in the 21st century......!!