Before you do anything else with Flash, drop the needle on the last half of “Ambitious,” the album’s chug-a-funk leadoff track. Just as singer Jimmy Hall steps back from the song’s skeletal tune and jackhammer rhythm with a Tarzanlike “yeah!” Jeff Beck’s guitar suddenly shoots up into the mix like a runaway jet, cutting a reckless path through Nile Rodgers’ spit ‘n’ polish production with sawtooth distortion and heat-ray feedback. Then, in a daredevil display of rock-guitar heroics that recalls Jimi Hendrix on Electric Ladyland in his full pyrotechnic glory, Beck yanks his guitar up and down flights of freakish harmonic steps, executes breathtaking suicide dives with his vibrato bar, and claws away at the song’s core riff with angry trills and harsh, scraping leads.