Thom Yorke on BBC

Thom Yorke tells BBC Radio 3 that Edward Norton wanted the Motherless Brooklyn theme to feel like an old standard from the 1950s, one that could turn into jazz through the film. The first idea he had from the script was the only one he felt anything for, and Norton took it at once. Weeks later Wynton Marsalis's players turned it into a jazz standard off the cuff and gave him a real buzz. His rough version is the one in the film, and when he tried a proper one it was no good, so Norton got Flea to try the trumpet.