The song became their greatest hit, reaching number seven on the U.S. Billboard Hot 100[2] and spending two weeks at number five on Cash Box. It did best in Canada, where it reached number two on the Pop singles chart,[3] blocked from the top spot only by the Eagles' "Hotel California". "So in to You" was also a hit on the Adult Contemporary charts of both nations. It reached number 11 on the U.S. AC chart and number 12 on the Canadian AC chart.[4]
In "So in to You," the singer admits an instant and mysteriously compelling attraction to a stranger entering the room, and is unable to focus on anything else. He attempts to gain the stranger's attention, hoping that they will be able to make a personal connection and that the "vibe" he feels will be mutual.