"Music to Watch Girls By" was the first Top 40 hit by Bob Crewe using his own name, recorded by his group The Bob Crewe Generation. Crewe first heard the song performed in a "jingledemo" for a Diet Pepsi commercial. Music was composed by Sidney "Sid" Ramin. The "big-band, horn driven" recording went to #15 on the pop chart and #2 on the Easy Listening chart. According to Greg Adams, writing for All Music Guide, the song "exemplified the groovy state of instrumental music at that time."