"How Can I Be Sure" is a popular song written by Felix Cavaliere and Eddie Brigati, and originally recorded by the Young Rascals for their 1967 album Groovin' with a single release in August 1967 affording the group their fourth Top 10 hit peaking at #4. "How Can I Be Sure" reached #4 on the Hot 100 in Billboard in October 1967, ranking as the most successful (Young) Rascals' hit featuring a lead vocal by Eddie Brigati. The single's B-side, "I'm So Happy Now" (also included on the Groovin album), was written and sung by Rascals guitarist Gene Cornish. Featuring a unique guitar phase-out ending, it was the first Cornish-penned song to appear on a Rascals single. Background Of a rock-oriented band such as the (Young) Rascals introducing a traditional pop-style song such as "How Can I Be Sure" Cavaliere has stated: "The only reason we were brave enough to do that was [that] the Beatles did 'Michelle' and 'Yesterday'." (Cavaliere had an especial awareness of the Beatles, having toured Europe with them in 1963 when he was a member of Joey Dee and the Starliters; the Rascals would also open for the Beatles at Shea Stadium 15 August 1965). The track features the sounds of a trumpet, bass, piano, drums, and strings, suggesting the sounds of cabaret music as well as a concertina, chosen so as to add to the song the vibe of a French café. The song's musical styles include blue-eyed soul and pop. "How Can I Be Sure" was one of several songs inspired by group founder Felix Cavaliere's girlfriend Adrienne Becchuri, a Pelham (New York) high school student Cavaliere met in 1966, the year he turned 24: (Felix Cavaliere quote:) "I fell madly in love with this woman who actually turned out to be a muse...[R]eally the only reason she was in my life [was to] spark that kind of emotion and feeling that generates those types of songs." Cavaliere and Buccheri remained a couple for a year, with Cavaliere first celebrating Buccheri in the blissful Rascals' hits "Groovin' and "A Girl Like You", and then with the introspective "How Can I Be Sure" expressing doubts about the relationship — he and Buccheri had recently become engaged — and despite the positive resolution of the song Cavaliere did in fact discover that she was too young ((Felix Cavaliere quote:)"I woke up one day and said: