Watch a video featuring Andris Nelsons and the BSO. Here he conducts the BSO's second world premiere of the season, a concerto written by Boston-based composer Michael Gandolfi for Symphony Hall's remarkable, recently restored Aeolian-Skinner organ. Gandolfi's dynamic, pattern-infused, colorful works include the earlier BSO commissions The Garden of Cosmic Speculation (premiered by the Tanglewood Music Center Orchestra) and Night Train to Perugia (premiered by the BSO in 2012).