It’s been a while since the Milwaukee Symphony Orchestra got any good news about its ticket sales, but this week, the orchestra announced that single ticket sales have jumped 20% in the current season, and credited the MSO’s newly customer-driven marketing focus for the gain. The orchestra has also been playing a new series of “scaled-down performances of that weekend’s concert programming combined with a video presentation designed to introduce the music and composers to a new audience,” which have attracted large numbers of new ticket-buyers.