The Kalin Twins (born February 16, 1934), also known as Hal and Herbie, were an American pop singing, songwriting and recording duo, formed in 1958 by twin brothers Harold Kalin and Herbert Kalin. The duo is best remembered for their number one 1958 hit "When". == Career == The twins were born in Port Jervis, New York, but the family later moved to Washington, D.C. While working in a Washington nightclub in November 1957, they pooled their funds to make... [more on Wikipedia]