You might try
René Gruss' website. If his music won't work, you might try following his "Cool Music" link to find other modern composers.
Some composers commonly associated with the minimalist movement, of which Phillip Glass is a part, are Terry Riley, Steve Reich, and La Monte Young.
You could ask Bignaf. If he hasn't composed something of his own to fit the bill, he will probably know someone who has.

V/R
Shapley