She’s recorded several classical albums as well as an album of Sufi music, the devotional music of the Sufi Muslim. 33 Risler St. (Route 29), Stockton, N.J. Tickets: $25; free, students up to 26 wi. Hanson-Koobs Chamber Music Series Pianist Julio Elizalde. www.salastina.org. Soweto Gospel Choir: Songs of the Free The South African a cappella group salutes Nelson Mandela. Younes and Soraya Naza. The Classical period was an era of…