Recording Artists - Music to Watch Girls By

Who was the artist for the recording that first popularized “Music to Watch Girls By”? Was it Andy Williams? Or was it an instrumental version by someone like Al Hirt?

The song was first popularized as a Diet Pepsi commercial jingle. The instrumental version by the Bob Crewe Generation was the first and biggest chart hit, reaching #15 in early 1967. The Andy Williams and Al Hirt covers followed a couple of months later, reaching #34 and 119 respectively.