MOHAMMAD REZA SHAJARIAN (Thursday) Renowned in his native Iran, the vocalist Mohammad Reza Shajarian has been performing since the 1960s, and is now widely considered one of the finest classical Persian singers in the world. Mr. Shajarian’s son, Homayoun Shajarian, will provide additional vocals and tombak (goblet drum), while Ensemble Ava, a four-piece, will contribute additional instrumentation on the ancient Persian instruments barbat (short-necked lute), tar (long-necked lute), kamancheh (spike fiddle) and daf (frame drum).