 On July 18, "Wouldn't It Be Nice" was released backed with "God Only Knows" in the United States, which was the third single from the "Pet Sounds" album, released two months before.It entered the "Billboard" chart on July 30 and remained there for 11 weeks, peaking at number 8 in September 1966.The single also peaked at number 7 on the "Cash Box" chart and number 5 in "Record World".