Actually, "Silhouettes" was "covered" by another group:

It was common in the Fifties for black groups to write and record songs, but sign over the publishing rights to the record company's in-house publishing company. Then the publishing company would lease out the rights to a white group that would "cover" (release its own version) of the song(s). In the case of the Rays: Their single had "Silhouettes" as the "A" side, and "Daddy Cool" as the "B" side. "Sihouettes" got to the Top 40. Within two weeks, a white Canadian group, the Diamonds, covered both sides of the Rays' single. The Diamonds' "Silhouettes" also got into the Top 40. The Diamonds were notorious for covering black groups' hits: They had "Little Darlin" (original by the Gladiolas), and "The Stroll" (Chuck Willis), among others.