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Turning To Gold
OK, so maybe it's not what I thought. Seems like they did do some outdoor night shows during 1970, 1972 and 1976. I thought maybe it was a conscious decision or something. Interesting!
The lighting wasn't quite what it was today and a LOT of outdoor shows took place in the daytime. Not really a conscious decision to not play in the dark but more the way the industry worked then.
Concert lighting was revolutionized in the 1980's (by Journey their Nocturne Productions).
The band probably didn't start micromanaging / advancing every minute detail until later on too.