well aside from the Cyrkle being my guilty pleasure when it comes to pop, i would have to put Harry Nillson's Nillson Schmilson up on the list.
I'd say something by the Kinks, maybe Village Green Preservation Society.... or something by the Buzzcocks maybe...definitely someone English
An early Elton John album comes to mind when thinking of great pop albums.. Too hard to make any definitive choices, though.
'Pet Sounds' is a very good candidate. I would say that this is also a good candidate for the best pop album of all time. Ironically;when released in november 1967 it didn't even manage to get into the Billboard Top 100 LP Chart: -'FOREVER CHANGES' _- _ LOVE . November 1967.
That was the case for many great albums of the time... The Velvet Underground, The Stooges, The Jimi Hendrix Experience, The Mothers, Pink Floyd's debut all had the same problem.