Soon after, David Crosby introduced himself to the duo at The Troubadour and began harmonizing with them on some of their songs. Impressed by the blend of their voices, the three musicians formed a trio and named themselves the Jet Set, a moniker inspired by McGuinn's love of aeronautics.
Crosby introduced McGuinn and Clark to his associate Jim Dickson, who had access to World Pacific Studios, where he had been recording demos of Crosby. Sensing the trio's potential, Dickson quickly took on management duties for the group, while his business partner, Eddie Tickner, became the group's accountant and financial manager. Dickson began utilizing World Pacific Studios to record the trio as they honed their craft and perfected their blend of Beatles pop and Bob Dylan-style folk. It was during the rehearsals at World Pacific that the band's folk rock sound—an amalgam of their own Beatles-influenced material, their folk music roots and their Beatlesque covers of contemporary folk songs—began to coalesce. Initially, this blend arose organically, but as rehearsals continued, the band began to actively attempt to bridge the gap between folk music and rock. Demo recordings made by the Jet Set at World Pacific Studios would later be collected on the compilation albums Preflyte, In the Beginning, The Preflyte Sessions and Preflyte Plus.
Drummer Michael Clarke was added to the Jet Set in mid-1964. Clarke was recruited largely due to his good looks and Brian Jones-esque hairstyle, rather than for his musical experience, which was limited to having played congas in a semi-professional capacity in and around San Francisco and L.A. Clarke did not even own his own drum kit and initially had to play on a makeshift setup consisting of cardboard boxes and a tambourine.