The Massachusetts Bay Transportation Authority (MBTA) is a quasi-governmental organization formed in 1964 that controls most bus, subway, commuter rail and ferry systems in Boston area. Originally the agency was called the Metropolitan Transportation Authority, or the MTA, as immortalized in the popular folk-protest lament "The MTA Song". The Boston subway system is known by residents as simply The T because of the logo the MBTA adopted in the 1960s, that of the letter "T" in a circle.