"Music to Watch Girls By" was the first Top 40 hit by Bob Crewe

Bob Crewe

Bob Crewe is an American songwriter, dancer, singer, manager, record producer and fine artist. He is known for producing, and co-writing with Bob Gaudio, a string of Top 10 singles for The Four Seasons...

 using his own name, recorded by his group The Bob Crewe Generation. Crewe first heard the song performed in a "jingle

Jingle

A jingle is a short tune used in advertising and for other commercial uses. The jingle contains one or more hooks and lyrics that explicitly promote the product being advertised, usually through the use of one or more advertising slogans. Ad buyers use jingles in radio and television...

 demo

Demo (marketing)

In marketing, an in-store demonstration is a promotion where samples of a product are distributed to customers within a store. The goal of an in-store demonstration is to introduce customers to the product in hopes of getting them to purchase that item...

" for a Diet Pepsi

Diet Pepsi

Diet Pepsi is a no-calorie carbonated cola soft drink produced by PepsiCo, introduced in 1964 as a variant of Pepsi-Cola with no sugar. First test marketed in 1963 under the name Patio Diet Cola, it was re-branded as Diet Pepsi the following year, becoming the first diet cola to be distributed on a...

 commercial. The "big-band, horn driven" recording went to #15 on the pop chart

Billboard Hot 100

The Billboard Hot 100 is the United States music industry standard singles popularity chart issued weekly by Billboard magazine. Chart rankings are based on radio play and sales; the tracking-week for sales begins on Monday and ends on Sunday, while the radio play tracking-week runs from Wednesday...

 and #2 on the Easy Listening chart. According to Greg Adams, writing for All Music Guide, the song "exemplified the groovy

Groovy

Groovy is a slang colloquialism popular during the 1960s and 1970s, springing out of African American culture. It is roughly synonymous with words such as "cool", "excellent", "fashionable", or "amazing", depending on context....

 state of instrumental music at that time."

Other instrumental versions of the song were recorded by Billy Vaughn

Billy Vaughn

Richard "Billy" Vaughn was an American singer, multi-instrumentalist, orchestra leader, and A&R man for Dot Records....

, Chet Atkins

Chet Atkins

Chester Burton Atkins , known as Chet Atkins, was an American guitarist and record producer who, along with Owen Bradley, created the smoother country music style known as the Nashville sound, which expanded country's appeal to adult pop music fans as well.Atkins's picking style, inspired by Merle...

, Al Hirt

Al Hirt

Al Hirt was an American trumpeter and bandleader. He is best remembered for his million selling recordings of "Java", and the accompanying album, Honey in the Horn . His nicknames included 'Jumbo' and 'The Round Mound of Sound'...

 and Walter Wanderley. The version by Andy Williams

Andy Williams

Howard Andrew "Andy" Williams is an American singer who has recorded 18 Gold- and three Platinum-certified albums. He hosted The Andy Williams Show, a TV variety show, from 1962 to 1971, as well as numerous television specials, and owns his own theater, the Moon River Theatre in Branson, Missouri,...

 went to #34 in the United States, and after it was used in a Fiat

Fiat

FIAT, an acronym for Fabbrica Italiana Automobili Torino , is an Italian automobile manufacturer, engine manufacturer, financial, and industrial group based in Turin in the Italian region of Piedmont. Fiat was founded in 1899 by a group of investors including Giovanni Agnelli...

 ad in the UK, the re-released single reached the top ten..