Hi all,
Browsing the internet finds an interesting article on this special guitarist (really how many people played on both California Dreamin and Monday Monday?).
http://www.marinij.com/fairfax/ci_8540874I don't really want to upset anyone by writing here what I found to be interesting, just in case it is not true.
However, there is also much discussion behind the scenes of the wikipedia entry on Cass Elliot, which is actually interesting reading as the good people who edited the entry on Cass Elliot find the right citations to correct the urban legends, myths, and that big mystery I am not writing about here.
Dave