Matthew James Joines (born 27 May 2006), known professionally as Asteria (stylized in all lowercase), is a New Zealand record producer, singer, and songwriter currently based in Warsaw, Poland. He is a prominent figure in the "scenecore" and krushclub subgenres, known for a production style he describes as "sonic anarchy." As of 2026, he has reached over 1.2 million monthly listeners on Spotify.
Joines was born and raised in Whanganui, New Zealand. He began his musical career at age 14, producing and mixing beats in 2021 under the names Crayola and Smilecrayola as part of the Goreset collective.
In 2023, Asteria began collaborating with Polish artist Kets4eki, releasing the joint album Rave2Death. During this period, he joined the FabFantasy collective alongside artists such as 6arelyhuman, D3r, and Kets4eki. He produced the track "Faster n Harder" for 6arelyhuman, which became a viral success on TikTok and appeared on the Billboard Hot Dance/Electronic Songs chart.
His 2023 single "What You Want!", featuring the virtual singer Hatsune Miku, surpassed 60 million streams on Spotify. In 2024, he released "Eyes on Me", a departure from his usual style as it utilized his natural vocal register.
In 2025, Asteria founded his own independent label and creative collective, Anarchist Sanctuary. On 20 August 2025, he released his debut solo studio album, Asteria Vol. 1, featuring 12 tracks recorded in non-traditional settings such as kitchens and Airbnbs, to maintain an "un-commercialized" sound. In June 2025, he performed a series of shows in Poland, including venues in Poznaà  and Kraków.
Joines dated Russian-Estonian model and singer Britney Manson until mid-2024, when he announced their breakup on an Instagram story. His musical influences include Osquinn, Odetari, Lil Peep, and Wifiskeleton.