Mystic Quest is a european name for Final Fantasy Adventure (USA) or Seiken Densetsu: Final Fantasy Gaiden (Japan)
This is original version https://www.youtube.com/watch?v=H2Zs31mBJXs&list=PLEC0679F4ABB49D7A&index=12
This is from the PAL version of Mystic Quest. We know it as "Final Fantasy Adventure" here.
I DO like it though. :)
I do not recall this song playing anywhere in Mystic Quest.
Sure this is from Mystic Quest?
Please contact me if you would like to use this in a project. We can discuss the details.