Sad to hear this news. RIP Bob.
A few YouTube clips that include Bob on bass guitar:
From Fleetwood Mac's debut gig at Windsor:
http://www.youtube.com/watch?v=e08kol0ZzrM
Studio recording of "Long Grey Mare":
http://www.youtube.com/watch?v=HSvU8OXqmzM
From Tramp, with Danny Kirwan and Mick Fleetwood:
http://www.youtube.com/watch?v=V_v5r4rd5ZA