Mages of Mystralia - The Original Soundtrack -

[Jimby]

I haven't added them as they haven't been officially listed, but, I'm almost certain that Shota Nakama and the composer himself should be credited performers here.

This blog states that Nakama was working on guitar parts and there is definitely some guitar in here from what I've heard so far.
As for Antoine Vachon, he reveals in this interview that piano is his main instrument and there's a good deal of piano found throughout.

Again, I'm not going to put them in there but if it's evidence enough for anyone else then go for it.


EDIT - On the preview album, Antoine Vachon is credited as the pianist so I'm putting him on the main album

[Reveirg]

Hi there,

Credits are accurate as you put them, I indeed performed piano and some percussions, but Shota Nakama did not end up performing guitar on the soundtrack.

I'll put up the detailed track-by-track musician credits soon.

Thanks!

[Jimby]

Fantastic. Thanks very much.