OK - try this one...

[Emohawk]

Since there seems to be a bit of a Black Sabbath vibe so far, here's another one. This is sort of a seven degrees of separation thing, but you only need one link.

What's the link between:
Jeff Beck
Frank Zappa
John Mayall's Blues Breakers
Journey
Whitesnake

And...

Black Sabbath

[guitarzan]

they all use picks.......sorry. i give up.
you said it was only one so who is it?

[cbh747]

Aynsley Dunbar?

[Emohawk]

Aynsley Dunbar?

Bingo!

Aynsley has been involved with all the bands on the list, most often as a drummer, but he played guitar early on with the Mothers of Invention.

He is also credited with writing "Warning" from Sabbath's debut album. I don't think he actually ever played with Sabbath, but it wouldn't surprise me if he was involved with the boys on some pre-Sabbath band or other.

[guitarzan]

dang, i wasn't even thinking about drummers.
one track mind.