"Because" was written with the intention of being the Dave Clark Five's fifth US single, but the band's label, Epic Records, was initially resistant, believing the ballad strayed too far from the hit-making formula that had proven successful with the band's previous upbeat singles. In May 1964, the song was released in the UK as the B-side to "Can't You See That She's Mine". Clark insisted that "Because" be released as an A-side in the US, and Epic eventually agreed. The single entered the Billboard Hot 100 chart at number sixty in August, and peaked six weeks later at number three. "Because" became the band's fifth US single to sell more than one million copies. In Canada, the song reached number three on RPM magazine's singles chart.
In a review for the single, Billboard described "Because" as a "warmly romantic ballad ... that should keep [The Dave Clark Five] on the chart."Richie Unterberger of Allmusic said the song "was on about the same melodic level as all but the best of the early Beatles' compositions." Unterberger complimented the track's harmony vocals and chord changes, and felt the song "proved that the band had a more subtle dimension than was evident from the stomping hits that were their main diet."