This is the solo/whistle part from all versions of "The Riddle" song. Played/mixed by Gigi d'Agostino, Nik Kershaw or Prezioso & Marvin. E|-----------------------------------------------------------------| B|----0-1-1-3-1-0---------0-0---0-1-3-1-0---------------0----------| G|--2-------------2-0-0-2-----2-----------2-0-2-2-0-0-2------------| D|-----------------------------------------------------------------| A|-----------------------------------------------------------------| E|-----------------------------------------------------------------| It's very easy, so good luck!
https://primoaccordo.net/misc/the-riddle.htm