Mohammad Reza Shajarian (Persian: محمد رضا شجريان) (born September 23, 1940 in Mashhad, Iran) is an internationally and critically acclaimed Persian traditional singer, composer and Master (Ostad) of Persian music. A living legend of Persian classical music, Shajarian is also known for his mastery of Persian calligraphy and humanitarian activities. Shajarian is considered as one of the most celebrated world music artists.His best works have been in collaboration with Parviz Meshkatian