The group included Mohammed Reza Shajarian , Iran 's most celebrated classical singer , and his son Homayoun Shajarian , who also sang and pattered complex rhythms on the tombak , a goblet-shaped drum .
Homayoun Shajarian /people/person/nationality Iran
DT NN VBD NNP NNP NNP , NNP POS RBS JJ JJ NN , CC PRP$ NN NNP NNP , WP RB VBD CC VBD JJ NNS IN DT NN , DT JJ VB .
Homayoun Shajarian
PERSON
Iran
LOCATION
/people/person/nationality