Gustaph (stylized as GVSTΛPH) is a Belgian singer-songwriter, producer, and vocal coach who will represent Belgium in the Eurovision Song Contest 2023 in Liverpool with his song "Because of You". Born Stef Caers on July 5, 1980, in Leuven, Flemish Brabant, Gustaph started his musical journey while studying at the Royal Conservatory of Ghent, originally performing under the name Steffen. In 2000, he released his debut single "Gonna Lose You" , which peaked at number 22 on the Flemish singles chart. He then dropped his second single, "Sweetest Thing" .

After these releases, Gustaph shifted his focus towards song writing and producing. He also became a backing vocalist, lending his voice to Lady Linn, Willy Sommers, and others. In the early 2010s, he joined Hercules and Love Affair as one of the lead vocalists.

In addition to his career as a singer, Gustaph works as a vocal coach and teacher at the Royal Academy of Fine Arts (KASK) in Ghent. He has also performed as a backing vocalist for Sennek at the Eurovision Song Contest 2018 and for Hooverphonic at the Eurovision Song Contest 2021.

In November 2022, Gustaph was revealed as one of the seven participants in Eurosong 2023, Belgium's national selection for the Eurovision Song Contest. His song "Because of You" won the final in January, securing his spot as Belgium's representative in the upcoming contest.

The upcoming Eurovision will mark Belgium's 65th entry into the competition. Gustaph, who did not have the initial support of the jury or televoters in the Belgian national final, managed to secure the ticket to Liverpool. His song "Because Of You" is intended to be a club anthem, with a sound reminiscent of the London club scene in the 2000s. Despite its catchy beat and well-crafted arrangement, some may find the song slightly outdated. Nevertheless, others may appreciate its casual nature and ability to lift one's spirits.