Ebullient Geometries, a 13-minute work for trombone quartet, was written at the request of Mark Ammons for Utah Trombone Authority.  I think of much of my music as a series of geometric shapes, sometimes superimposed, more often juxtaposed.  This one is certainly no exception.  The structure of the work bears similarity to some of my other pieces: the slow, melodic, thin-textured interruptions of otherwise frantic material, the passage with a long melody accompanied by driving ostinato, and the extensive, static coda, to name a few.  The ending of the work is a considerable rewrite of the middle movement of Sundirt.