Hi!
For me, it was some bass-player in a band who came to our highschool for us to watch in music class.
After this, I listened to (and watched) Sting, Flea, Fieldy and lots of others.
My latest attatchments are Stanley Clarke, Jaco, Ozomatli, Bootsy, Les Claypool, Louis Johnson, Mark King, Aston Barrett, Billy Sheehan, Tony Kanal, Marcus Miller, Esperanza Spalding, and many others.
Ultimately, I tend to find it an endless journey, and I think it was Sting and the Police which got me listening to music in the first place - listening to it growing up when I was a kid.
Cheers, good question!
JOHN