Kallatt Hari learned kalamezhuthum pattu from his father "Unnikrishnan Kurupp" and is a beginner in this field, but has managed to do kalam pattu in a good manner. He learnt the Kallam pattu of Bhagavathy, Vettekaran, Ayyappan, Brahmarakshsan Kalam etc. He participated in "Kalamezhuthu Ultsavam" conducted by Kerala Lalithakala Academy Thrissur on November 2010
Now he is performing Kalam pattu with his father and also alone. He used to perform Kalampattu in Payyoorkav Durgabhagavathy temple (Koonammoochy), Thayankav Ayyappan temple (Choondal), Alkal Brahmarakshsan temple (Punnathur kotta - Guruvayoor), Harikanyaka temple (Ariyannuur), Njamanengadu Bhagavathy temple (Anjoor) etc. Now he is trying to carry on in this field along with his teaching profession (HSST Physics CVM HSS Vandazhy - Vadakkumchery Managalam dam route ) .