Judy Garland died on this day in 1999 while Fredastaire died on this day 2 years earlier.
OK so are you asking whether JG & FA are really “real rock” people? Too right they are. FA was obsessed with perfection but what made him real rock was his refusal to treat the audience as dummies.
As for JG she lived the rock’n’roll life before R’n’R.