Meditation sur les 12 heures de la nuit

This piece is a strange music where each 6 measures the key signature is raised by a semitone. So the music starts in B flat minor, then B minor, C minor , C# minor .... and so on until the 12 tones are used. Each tone represents an hour of the night. May be you will find that is not very musical, but see it please only as a game