In over 30 years of performing, South Africa’s a cappella male ensemble Ladysmith Black Mambazo has achieved renown for their tight, sonorous harmonies and uplifting performances. Thanks to their 1986 Graveland collaboration with Paul Simon, they have also garnered a much-deserved Grammy and seven additional grammy nominations (the latest being 2004).

Now they team up with the strings of the English Chamber Orchestra conducted by Ralf Gothoni for a gorgeous, soulful excursion that mixes original compositions by group founder Joseph Shabalala and album arranger Isak Roux with classics by Mozart, Schubert, and Bach. As improbable as this may sound, the project’s precedent was the boundary-breaking Shabalala/Simon arrangement of “Amazing Grace” that initially catapulted them to international fame. Presented here with orchestra, “Amazing Grave” joins a beautiful “Ave Verum Corpus,” and a Zulufied Schubert Sanctus, melding faith and spirit in performances that smack less of crossover than of heart fire. The group performs in Cambridge’s Sanders Theater on April 23.