Toccata in the form of a train

[ronde_des_sylphes]

...or at least the musical depiction of a (devilish) train.

The devilish aspect is symbolised by the multitude of tritones; little hints of the Dies Irae also.

Alkan allusion in the title, of course.

This did begin from an improvisation but is one of the few pieces I'm posting just now where I can say that I sat down and worked out specific compositional aspects, rather than just tinkering around the edges of an improvisation to add coherence,

Recorded as part of a very long full-day session on a nice grand piano.