Well, not sure if all "Oldies" stations follow the same criteria for what they consider an "Oldie" but the station here in PHX, KOOL Gold FM, builds their playlist from songs that are 25 years old or older - which, for whatever reason, irks me when I hear ANYTHING by Journey on THAT station.

But, to answer your question, here's a couple that quickly came to mind...
Ooga, chaka, ooga ooga ooga chaka....
http://www.youtube.com/watch?v=Es92rIBb ... re=related
Head East - "Never Been Any Reason"
http://www.youtube.com/watch?v=R7jW8_2Us5c
And, from the law offices of Hamilton, Joe Frank, and Reynolds,
http://www.youtube.com/watch?v=cfcilKhaWx4
Climax - Precious and Few
http://www.youtube.com/watch?v=I95xCjQe ... re=related
Kenny Nolan - "I Like Dreamin'"
http://www.youtube.com/watch?v=I95xCjQe ... re=related (Man-oh-man... this song was GIGANTICALLY HUGE when I was in 7th grade!
A couple more...
Tod Rungren - "Hello it's me..."
http://www.youtube.com/watch?v=lLeCB7Kn ... re=related
David Soul - "Don't Give Up On Us Baby"
http://www.youtube.com/watch?v=YY8APrYU ... re=related
RUSH - "Spirit of Radio"
http://www.youtube.com/watch?v=5Tq-UsaRchI (One of those songs that justifies the $$ spent on my sound system!)
And what 70's "guilty pleasure" song list would be complete without at least something by the BeeGee's?
(The links take you to a band from Brazil called Blow-Up who does outstanding covers of these two particular songs ... and they're playing these covers live in a mall!!! )
"How Deep is Your Love?" -
http://www.youtube.com/watch?v=EdyDoa0tWpU
Fantasy by Earth Wind and Fire -
http://www.youtube.com/watch?v=fl2O3d9hqaA