Who were the heaviest sticks of the 20th century ?

Who were the heaviest sticks of the 20th century ? “Two conductors, both alike in dignity (?), In fair Berlin, where we lay our scene, From ancient grudge break to new mutiny, Where civil quarrel makes art unclean. From forth the strive of these two foes Will last and long their star-cross’d life; Whose misadventured…