Karen Campbell for Boston.com

One of the greatest pleasures of any concert by the Mark Morris Dance Group is the live music that ignites the dance. “Mozart Dances,’’ given its Boston premiere last night in the troupe’s Celebrity Series engagement, offers a veritable feast. Morris’s three-part dance work is set to piano concerti and a sonata by Mozart, all given fine performances by pianists Russell Sherman and Minsoo Sohn with the Orchestra of Emmanuel Music under conductor Jane Glover.