Eric Satie's Gymnopédies are not far removed from his Gnossiennes in construction, with a similar tempo, left hand and slightly odd harmonic nature. This is the first of 3 Gymnopédies and has a melancholy, deep-in-thought feel to it. Alternative versions of this piece on mfiles include arrangements for Flute (or Oboe or Recorder) and Piano, Clarinet (in Bb) and Piano, Bassoon and Piano, Violin (or Viola) and Piano and Cello and Piano. The full set of three Gymnopédies for piano is available from Sheet Music Plus (US) and the first three Gnossiennes can be found at The Music Room (UK).
Here is a video of the original piano version. Scroll down the page to see the sheet music directly: