Just finished listening. My vote is: it's simply someone in the band slapping his thigh, or maybe tapping a wood block. There seem to be slight imperfections in the "clicking" sound, which may rule out a metronome. The tapping is a bit odd, but many older recordings contain production oddities or mistakes which really make those tunes "cooler" than they'd be under today's more refined and slicker production. (I will now undermine that thought by admitting that I like the slicker remake of Winter's Night better than the original! The deeper vocals, the lush violins, and denser instrumentation are soothingly gorgeous.)
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And I will always love
that sound until the day
I die.
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