"Time After Time"
The Original
First it was a number 1 hit for Cyndi Lauper, co-written by Lauper and Rob Hyman of The Hooters it has become a multi genre classic.
The Best
For my money the best version is by Miles Davis from his "Your Under Arrest" album.
Second Place
"Time After Time" was recorded by Cassandra Wilson for her tribute to Miles album called "Travelling Miles".
Third Place
One of the most beautiful voices belonged to Eva Cassidy, here she is singing "Time After Time" live.
Honorable Mention
Honorable mention goes to The Hooters since one of their members co-wrote the song with Cyndi Lauper, her original version I would place in 4th or 5th place.