Oooh ... Forgot him. No matter what, "Isn't She Lovely" and "Master Blaster" always put an enormous smile on my face. (Let's not mention "I Just Called", shall we?)
http://www.youtube.com/watch?v=Cp0Oh6Ckh1M
http://www.youtube.com/watch?v=hyqClwGu_Sk
Forgot Sly as well.
http://www.youtube.com/watch?v=4G861C3J9ms&feature=related
I mentioned Brian Wilson already, but nevertheless:
http://www.youtube.com/watch?v=BC_UILNwWrc&feature=related
In my opinion, that one's the best pop song ever written. (Though 'Waterloo Sunset' is a close second.)