"By its fruit we judge the tree. Judge the tree by its fruit then, and do not meddle with the roots. Function justifies an organ, no matter how strange the organ may appear in the eyes of those who are not accustomed to see it functioning. […] though the unhampered play of its functions, then, that a work is revealed and justified. We are free to accept or reject this play, but no one has the right to question the fact of its existence. To judge, dispute, and criticize the principle of speculative volition which is at the origin of all creation is thus manifestly useless. In the pure state, music is free speculation. Artists of all epochs have unceasingly testified to this concept." - Igor Stravinsky, Poetics of Music.
Five Works for Improvising Trumpets consists of five unique parts, each standing alone as an entire piece of music, yet tied together by a common thread. The details may vary from performance to performance, but the speculation remains constant.
