There are a two popular pieces with this title which I found
at a quick glance:

Meyerbeer, Giacomo      1791-1864
  From the Opera: Dinorah, ou le Pardon de Ploermel (Dinorah, oder die
  Wallfahrt nach Ploermel - Dinorah, Or The Pardon of Ploermel) [1859],
  Schattentanz (Dance Of The Shadows).

MacDowell, Edward Alex. 1861-1908
  Shadow Dance (Schattentanz) fis-Moll Op.39, 8.

There might be other titles with the same name not in my data base.

Regards
Gerhard Dangel-Reese
Augustiner Museum, Freiburg

 [ A possibility is a song adaptation from "Ballet des Ombres Heuereses",
 [ by Gluck (or Glueck);  also a similar title by Berlioz.  -- Robbie