Williams was chosen to represent Switzerland at the Eurovision Song Contest 1959 with the song "Irgendwoher" (From Somewhere). The song finished fourth out of 11 songs, and gained a total of 14 points.
- At the Green Cockatoo by Night (1957)
- The Legs of Dolores (1957)
- Every Day Isn't Sunday (1959)
- Pension Schöller (1960)
- I Learned That in Paris (1960)
|Awards and achievements|
| Switzerland in the Eurovision Song Contest
with "Cielo e terra"