He used to put in thirteen hours of singing practice every day .
In his teens , inspired by the songs of Mehdi Hassan , Hariharan developed a passion for ghazals and started training in Hindustani music from Ustad Ghulam Mustafa Khan .
Hariharan used to put in thirteen hours of singing practice every day .
In his teens , inspired by the songs of Mehdi Hassan , Hariharan developed a passion for ghazals and started training in Hindustani music from Ustad Ghulam Mustafa Khan .