Judging by the definition being used, we can pretty much find dated material from any band that reflected its era either musically, lyrically or both. Seems to me the more connected a band was or is to its era, the greater the risk of being tabbed as "dated". CSNY and Jefferson Airplane must...
I read somewhere not too long ago that todays 20-30 year old parents are the first generation of parents which by and large didn't grow up listening to the Beatles. It took Queen being an active band for 31 years to overtake a band that was active for all of 7 years. I'm surprised it didn't...