In Rememberance of Three Cool Cats

Ah MLP, what sort of pop culture reference would you come up with next or what reference have I missed? Monty Python (both films and tv)? Michael Jackson? Bee Gees? Big Bang Theory? Quite frankly, who knows?

But in all seriousness, though, seeing a Beatles reference in MLP made me really happy. I wanted to know more about Pinkie Pie's time with the Beatle Ponies.  

MLP:FiM (c) Hasbro
Artwork (c) Yours Truly