Who was the composer who used a mountain ridge to compose music?

I think it was a South American composer who threw open his window and drew the outline of the mountain ridge outside and then composed music following the line of the mountain. Any ideas?

The theme to Brasilian composer Villa-Lobos' Symphony No. 6 was suggested by the outline of some Brasilian mountains.

A.

John Denver! Oh just kidding, I have no idea. Good question though. You get a star.