Playing this again...by chance, does anybody know anything further about the trumpeters here, Robert Nagel & Allan Dean? Don't know which is who, but there's a sureness of phrasing on display that is certainly impressive, and immediately appreciated by this listener. The entire ensemble is impressive (as are Schuller's readings), but the trumpet playing is, when it occurs, the final micro-focusing of the lens. Or so it sounds to my ears on these first few listenings.
Going back many years, Nagel was a friend of a friend. I will see what I can find.