After "Hey Jude" was released, any number of artists wrote songs with long repeating choruses. A few examples that come to mind are T-Rex' "Hot Love", Bowie's "Memory of a Free Festival", Tommy James & The Shondells' "Ball of Fire", and of course Donovan's "Atlantis". But here's the thing: Donovan recorded "Atlantis" in May of 1968, and The Beatles recorded "Hey Jude" in July/August of 1968. So... Did Donovan get there first? Rumor has it that McCartney may have sang on Donovan's recording... even played tambourine on it... but according to Wikipedia, that didn't happen. Still... did one artist take their cue from another, or just happy coincidence?