Derek Christoff, better known by his stage name D-Sisive, is a Canadian rapper, best known for his Juno-nominated EP The Book, his hit single "Nobody with a Notepad" (for which D-Sisive and collaborator Muneshine won SOCAN's fourth annual ECHO Songwriting Prize) and his 2009 Polaris Music Prize-nominated album Let the Children Die (which was launched by the success of "Nobody with a Notepad").