Holt's early contributions include minor roles as orchestrator and copyist on films such as "Stardust". After graduating, she composed her own music for a number of short films, including the Royal Television Society award-winning short "Friends Forever" (2008), while working as a professional violinist. In 2007, she became part of RaVen Quartet, a London-based string quartet that performed their own musical arrangements. RaVen would go on to perform with Madness during the 2012 London Olympics closing ceremony. By this time, the group had also played for Prince Harry at Buckingham Palace and were part of George Michael's Symphonica tour.