It's possible:
* You're thinking of a different name: Could you double-check the spelling or provide any other details about the singer?
* The singer is less famous: There might be a singer named Bert Robinson who is not widely known.
* There's a misunderstanding: Perhaps you're thinking of a different person with a similar name.
If you can provide any more details, I might be able to help you find the information you're looking for.