Help Need for Black Teetar - Karachi - hen cages

Salam, My dear friend's i have just bought Black Teetar from Empress Market Today. He was ok when i bring and when i kept him cage till then he is ok but when suddenly somebody goes near to his cage. he start singing and he start jumping in cage..Why he isdoing please expert of Black Teetar please advice me and kindlytell me what food should i provide him. im giving him normal food like my hen's eat Lal Chawala Bajra mix. but he did'nt eated too much.I'm waiting for my friend's replies.