“Enharmonicon left a deep impression. The combination of clarinet, trumpet and violin gives off a natural, vivid color combination. The contrapuntal exchange of short phrases and single strokes, along with a use of silence, has both reticence and eloquence. There is a quiet confidence here requiring no salesmanship. “
Bernard Holland The New York Times

“Greenbaum has developed a rich, personal voice, unique in contemporary music. Its clarity, unusually refined sense of structure and immediate communicative nature make it a great pleasure to perform. In the remarkable on the river the shadowy group, imaginative instrumental color heightens the expressive content of the music. This consistent quality of his work is appreciated by performers, critics, and audiences alike.”

Charles Abramovic

"Greenbaum’s mental metabolic rate is considerably higher than that of other people. It should not surprise, therefore, that the same brilliant impetuosity of thought and expression characterizes his musical speech as well. And when the latter seems to be most tranquil, watch out! There's something boiling under that deceptively placid surface which will very shortly erupt!

In his on the river the shadowy group, Matthew has skillfully given voice to two contrasting characteristics of the baritone saxophone. In the first movement, it sings an expressive, lyrical, legato song (over the sophisticated, intricate rhythms of the piano) and, in the second, it punches out the brassy, raucous bark of a disjunct, jazzy melody.
Finally, a grownup piece for the baritone saxophone - probably the best yet in its repertoire!"
Marshall Taylor