 Entwistle also experimented throughout his career with "Bi-amping," where the high and low ends of the bass are sent through separate signal paths, allowing for more control over the output.At one point his rig became so loaded down with speaker cabinets and processing gear that it was dubbed "Little Manhattan," in reference to the towering, skyscraper-like stacks, racks and blinking lights.While Townshend emerged as the Who's songwriter-in-chief, Entwistle began making distinctive contributions to the band's catalogue, beginning with "Whiskey Man" and "Boris the Spider" on the "A Quick One" album in 1966, continuing with "Doctor, Doctor" and "Someone's Coming" (1967); "Silas Stingy", "Heinz Baked Beans" and "Medac" from "The Who Sell Out" (1967); "Dr. Jekyll & Mr. Hyde" (1968); and "Heaven and Hell", with which the Who opened their live shows between 1968 and 1970.