leeneia, Purcell did not create that MIDI file of an arrangement for recorders. The page says it is "incidental music [for the tragedy] Abdelazer originally for strings". I do not see why it could not be played in a graceful and danceable way, or even "folky", without changeing a single note written by Purcell.

"Folk" arrangements that consist only of the melody and "chords" definitely wrong Purcell and his music, which relies on the counterpoint parts. (We had this discussion with other composers' music before.) In Purcell's days, a "folk" dance musician was required to know more about counterpoint than most present-day "classical" musicians.

Whoever adapts a piece from one style to another should be quite sure to understand them both.