I'm not sure what "rock drum beats" exactly means to you, but Frank always employed odd and/or shifting meters as well as more standardized rock rhythms. And he was more "symph" than most symph-prog bands because he used real orchestral instruments. Just for one out of many, many examples, this short ditty has all of that going on... and the album came out in '68 (have fun counting ):
But yeah, plenty of his music qualifies as prog!
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