In fact the program is a study in contrast. Music from the early 20th century as well as very recent works; Mayer's 80th year and the young Lefkowitz at the beginning his career; and a contrast of styles with very free jazz and more regimented, composed music. But isn't America, also, a study in contrasts?
In reality it may not work, but this kind of concert fascinates me.
By the way, Wikipedia says Eric Dolphy recorded Varèse's Density 21.5.