Who sings Jeff theme song Modest?

Jeff's theme song, "Modest", is performed by the artist Daniel Pemberton. Pemberton is a British composer, producer, and musician known for his work in films, television, and video games. He has composed music for a variety of projects, including the films "The Man from U.N.C.L.E.", "Steve Jobs", and "Spider-Man: Into the Spider-Verse". Pemberton has also won several awards for his work, including an Emmy Award and a BAFTA Award.