For anyone interested in spicing up their pop music with some classical elements, I highly recommend the albums listed above by Stevemc. I added a few to the list 
Brian Wilson: 
Pet Sounds 
Smiley Smile 
Wild Honey 
Van Dyke Parks: 
Discover America 
Song Cycle 
Jump 
Randy Newman: 
12 Songs 
Sail Away 
Nilsson Sings Newman 
Paul Simon (!!!): 
Still Crazy After All These Years 
Their Goes Rhymin' Simon 
One Trick Pony 
Other miscellaneous recommendations... 
Harper's Bizzare (simon, newman, and parks all contributed heavily to the repetoire of this band early in their careers.. great production) : 
Feelin Groovy 
Anything Goes 
Bob Dylan:  
Self Portrait (Little sadie? Come on, that progression is freakin SWEET) 
The soundtrack to "Fantastic Planet" is an example of music that blended film scoring with pop music... 
Hope this helps! 
-Ezra