Logic:
1. The Beatles were the best band ever.
2. The bass player for The Beatles used a Hofner violin bass.
3. Therefore, the best bass ever is a Hofner violin bass. QED.
No need to thank me.
You're use of mathematical proof uses the assumption that The Beatles where the best band ever. Is this a result you can assume? Macca had also used a Rick and there's some photos of him floating around with a J bass. Does that mean Rick and J are also the best basses ever? I mean, sure we can assume existence, but existence doesn't imply uniqueness.