How about actual record sales and juke box plays? Back in the '50s, if you had a single in the Top 10 you were a "star", at least temporarily. Albums weren't a factor...........few were sold at the time. So Valens and The Bopper would qualify as stars at the time they died. Dick Clark's "Caravan Of Stars" contained many one-hit wonders.
Did true stars like the Beatles or the Stones or the Bee Gees (etc, etc.) ever play Clear Lake, IA?