Most Of All/ Siamese Cat

Here's a beautiful copy of this family singing group's very first single, including the rare picture sleeve! The sleeve has an outrageously teenzine promotional Cowsills history on the flip side that starts out,

So, what's a Cowsill, you may be asking?
Well, The Cowsills are four brothers (to each other, that is!).
And Cowsill is their real name--not merely some kooky term thought up as a "clever" name for a new rock group...