 There, after four months, he received the "Premier prix avec la plus grande distinction" (First prize, with the greatest distinction).It was at this point, as he was beginning his itinerant virtuoso career, that he met Arthur Rubinstein, through the invitation of Juliusz Wertheim.They immediately realised their shared musical sympathies, but the friendship, rich with youthful energy, really took off in 1907 with their concerts for the Warsaw Philharmonic, including duo performances of Beethoven's "Kreutzer" Sonata and Tchaikovsky's Piano Trio with the cellist J. Sabelik.