It was also used as the theme music in James Cagney's "The Fighting 69th." Warner Brothers used it a lot, actually. Once, when I was living in Maine and tv channel 6 could be picked up on the radio, I taped all of the instrumental and sung versions in "They Died With Their Boots On" (I'm also an Errol Flynn fan) but, alas, my ex-husband snagged the tape.

But I wrote a parody verse (c.1974) about watching Errol Flynn films:

"Instead of water we'll drink ale,
And watch Errol Flynn and Allan Hale
And never til the cable fails,
Will we get to bed before morning."

For what it's worth.

Bat Goddess