re: Catchiest Songs of All Time

Sugar, Sugar by The Archies. So catchy Bachman-Turner Overdrive stole the riff and used it on Let It Roll Down the Highway.

Louie, Louie-riff stolen by countless groups (listen closely to More Than a Feeling by Boston for example)

Bo Diddley/Who Do You Love-Bo Diddley-riff stolen by damn near everybody (Not Fade Away by Buddy Holly, practically every song George Thorogood knows, half the songs recorded by the Georgia Satellites, etc.)