The Elvis early 60s albums were remarkable for their time and still hold up now, in terms of stereo instrument/vocal placement. I think it was the same engineer who did The Everly Brothers and Roy Orbison's work of the same period.
The Beach Boys...a lot of their best work was never mixed into stereo at all back then. The single 'I Get Around' and basically every album/single from 1965's Today! through to Smiley Smile were only mono. Some have been given stereo mixes since.
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