40 Cal is a rapper from Harlem 25 years born Calvin Byrd and is part of the rap group The Diplomats, he is known for his battle and freestyle abilities and gained attention from the battle show Fight Klub 40 has called himself "Mr. Rewind That" as a moniker reflecting his abilities to spit metaphors as hip-hop heads rewind to catch the reference, after appearing in several The Diplomats albums and mixtapes he released a debut solo album, Broken Safety in August 2006