Matthew Sean Leon (born January 30, 1991) is a Canadian rapper, singer, and record producer from Toronto, Ontario. He is the founder of the IXXI Initiative, formed in 2012 in Toronto. The collective helped foster the career of Daniel Caesar in tandem with producers Jordan Evans & Matthew Burnett.

In July 2013, Leon released his debut mixtape Ninelevenne, the Tragedy followed by his second project Narcissus, the Drowning of Ego on January 22, 2014. Both projects featured production by Jordan Evans. Shortly after the release of Narcissus, Leon began the year-long roll out of the compilation King Of The Wild Things. followed with I Think You've Gone Mad (Or the Sins of the Father) in 2017. On November 29, 2017, Leon released an audio-film titled "C.C.W.M.T.T". 2018 had the release of the album Sean Leon (The Death Of) and in 2021 God's Algorithm which had a non-traditional album release, with no streaming service involved, and only available for purchase on a beta landing page where users interacted through visuals, audio files, NFTs, and apparel.

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