I think these are bona fide one hit wonders:
“Afternoon Delight”—Starland Vocal Band
“Seasons in the Sun”—Terry Jacks
and my personal vote
“Timothy” by the Buoys
Honorable Mention to C.W. McCall is hit #40 the year before “Convoy”.
I assume we are NOT accepting Country Charts or “Adult Contemporary”
CW McCall - Wolf Creek Pass. not a one-hit-wonder.
There are some good ones in that list.