Okay, I am sorry, but how could Mr. Geddy Lee not be included in that list? Sure, he doesn't play Alembics, but his sound and style have influenced almost every newcomer in the rock genre for 20 years! Also, he is the main reason I learned to play bass. Say what you want about RUSH and their music and his voice, but hands down he is one of the most versatile players there is.
Also, I could never think of leaving off Chris Squire too! And what about Mr. Dependable, Tony Levin?