“What key is it in, Robbie?” Ringo Starr, sitting behind a drum set, asks Robbie Robertson over the phone. Ringo nods. “F-demented!” What happens next is a joyous cover of “The Weight,” with Robertson reprising the recording’s soulful intro lick. A series of musicians from all over the world – Marcus King, Lukas Nelson, the Japanese guitar virtuoso Char, Congo soul singer Mermens Mosengo and more – all add their own flavor to the classic from different locations.