Tuhia he haere tonu mō tēnei wāhanga - I te Pakanga o te Hotoke
, i uru atu a Haitto ki tētahi haerenga konohete o te Rōpū Whero, i tae atu hoki ki Te Hononga o Amerika hei painga mo Finland. I purei a Haitto i te Whare Carnegie me Sir John Barbirolli, me etahi atu waahi, ka puta i te kiriata 1941 "The Hard-Boiled Canary". I te tau 1942 ka noho a Haitto raua ko Sirpo ki Portland, Oregon, a ka ako a Haitto ki a Ivan Galamian i te 1943-1945. I mohiotia a Haitto mo tana mahi whakaari: i purei ia i nga mahi a Niccolò Paganini i runga i te huarahi kore, a he pai ki a ia te puoro a J. S. Bach.