Marin Alsop’s accounts of these two symphonies are magnetically performed and brilliantly recorded. No. 2, much the longer work in three substantial movements, dates from 1994 and this is unreconstructed minimalism with unrelenting kaleidoscopic repetitions. No. 3, first heard in 1995, is little more than half the length, a piece for 19 strings and optional percussion, with the gentle opening movement serving as prelude to the second and third movements, the one fast, the other a measured chaconne. The fourth movement is brief and brilliant, drawing threads together.