Lawrence Ferlinghetti wrote a poem about them. Amy Tan’s mother was serenaded by them as she lay in state. Jessica Mitford’s memorial procession was led by them. And more than 300 Chinese families a year hire the Green Street Mortuary Band to give their loved ones a proper and musical send-off through the streets of Chinatown.The band traces its roots back to 1911 and the Cathay Chinese Boys Band, the first marching group in Chinatown.