Mahbubul Haque Khan (28 February 1950 - 5 June 2011), known as Azam Khan, was a Bangladeshi rock singer, songwriter and a freedom fighter.He took part in the Liberation War in 1971.He was the lead singer of the rock band "উচ্চারণ (Pronunciation)", a pioneer rock band of Bangladesh founded in the middle of 1973.He is often referred by the name "Rock Guru".He is considered to be the greatest musician in the country.