This is what happens when you start surfing around international Internet radio portals.
I came across this version of the old Kenny Vance and the Planetones doo-wop classic, "Looking for an Echo," as performed by this 50's-retro group, Ol' 55 (named after the Eagles song of years past).
First, here's the original version by Kenny Vance and the Planetones:
And here's the version from Ol' 55:
And just for kicks, here's a really swank a cappella doo-wop version by the Persuasions, as performed in the Spike Lee joint "Do It A Cappella":
All here... on K-Chuck Radio.