Effective period / Period of releases: 1958 - 2014

American pop singing, songwriting and recording twin brother singing duo Herbie & Hal Kalin.
Herbert Harry Kalin, born 16 February 1934, Port Jervis, New York Died 21 July 2006, Waldorf, Maryland (aged 72)
Harold Ross Kalin, born 16 February 1934, Port Jervis, New York Died 23 August 2005, Waldorf, Maryland (aged 71)
They charted four times between 1958 and 1959 in the U.S. Their top charting song was their first "When" in 1958--it hit #1 on the U.S. R&B chart, #1 in the U.K. overall, #13 on the U.S. country chart, and #5 overall in the U.S.