Kerry Brothers, Jr. (born October 1, 1970) better known as "Krucial" or "Krucial Keys" or as Alicia Keys often referred to him "K"; is Multi-Grammy Award winning producer who is an American songwriter, executive producer and record producer.He has worked on her four multi-platinum albums Songs in A Minor (2001), The Diary of Alicia Keys (2003), As I Am (2007) and The Element of Freedom (2009).