Many years ago in a used music shop in New York City I purchased a copy of "Forgotten Fairy Tales".
Copyright 1897 by P. L. Jung
Assigned 1899 to Arthur P. Schmidt
Copyright 1925 by Marian MacDowell
There is no reference anywhere in it to "op. 4", an assignment apparently made by someone after 1925.
From this sheet music I made this MIDI transcription of "Sung outside the Prince's door":
https://www.angelfire.com/ks/landzastanza/emfft1.midIt is an easy piece to play.
For 147 MacDowell piano pieces or movements transcribed into MIDI go to:
https://www.angelfire.com/ks/landzastanzaBy taking a tour through these MIDI sequences made from sheet music, it can be noticed that from 1896 on, about half of the pieces in MacDowell's piano suites are fairly easy to play.
Since MacDowell was a concert pianist when he began publishing compositions in 1883, his earlier works for piano were for virtuoso playing. After returning to America in 1888, he gradually developed a simpler, more direct style of expression. Average pianists can really enjoy playing through "Woodland Sketches", "Forgotten Fairy Tales", "Sea Pieces", "Fireside Tales", and "New England Idyls".