Stef Caers, known professionally as Gustaph (stylised as GVSTΛPH), is a Belgian singer-songwriter, producer and vocal coach. He is set to represent Belgium in the Eurovision Song Contest 2023 in Liverpool, United Kingdom with the song "Because of You". Caers was born on 5 July 1980 in Leuven, Flemish Brabant. He started his musical career while studying at the Royal Conservatory of Ghent, initially using the stage name Steffen. In 2000, he scored a hit with his debut single "Gonna Lose You"