Mason, who was mentored by Nick Grimshaw, was voted off X Factor last week after receiving the fewest votes.
But, moving on from the competition, he took to the stage at the popular London venue where he showed off his vocal abilities.
And Mason has already unveiled his new R&B single, 'Boyfriend'. Sharing the track via Soundcloud, Mason simply tweeted to fans over the weekend: "THIS is Mason Noise #Boyfriend."
Mason found himself eliminated on last Saturday's show in a flash vote, but after leaving the competition, he said in a single tweet: "RELIEVED".
Clarifying his tweet on Good Morning Britain, Mason said: "When you're in that bubble, it's a great opportunity for everyone. It gives you such a great platform and I'm grateful for that. People that know me knows that it wasn't completely me."
Mason also said he would "love" to have a career on the level of Justin Timberlake.
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Listen to Mason's song 'Boyfriend' below:
X Factor's most shocking moments: