Marin Alsop is a pioneer among women conductors. After witnessing her inspiring leadership in Shostakovich’s Symphony No. 7, “Leningrad,” with the Cincinnati Symphony Orchestra on Nov. 16, I’m convinced she is one of the great conductors of our time. Her artistry was on full display in Shostakovich’s sprawling, 75-minute symphony through raucous climaxes, emotional themes and bleak landscapes. From beginning to end, the orchestra performed with thrilling precision and power.