Oscar Kraals’s first professional gig was with Rosa King & Upside Down, after which he joined Candy Dulfer’s Funky Stuff and toured the world over. Furthermore, he toured with Keith Caputo, Dutch singer Frank Boeijen, and Postmen. He formed his own band, Seven, with which he released an album. Subsequently, he played with Anouk, The Dutch Eagles, and Niels Geusebroek. He is currently a member a band member for Belgian singer/songwriter Milow.