I haven't posted on this topic for a long time, but http://www.youtube.com
has a number of those old Ed Graham episodes form post...here is a
kind of update.

There were three credit sequences.. the one on youtube.. dissolving
"credit roll",
then the two actual rolling ones. The first two had Billie Bird a la
Emmett Kelley the
old tiem clown and later Carole Burnett "sadly" sweeping up the
spotlight, the network-change
version just had the gang eatin' the product.

What I noticed...
Our old ubiqitious friend Johnny Mann (and Thurl Ravenscroft, singing
as Mark Evanier noted years ago the praises of Linus DESPITE the
obvious competetion from Thurl's own tiger on Kellog's Frosted Flakes)
Singers, apparently ONLY with CBS, is credited for the first scene,
then (moonlighting from HB, Hoyt Curtin, in one of his period 1960s
non HB jobs (Beany Boy was an earlier one)(, is doing music chores).

As everyone knows, Sheldon Leonard, Carl Reiner, and some other names
mentioned in previous posts (if you do a Google searchg) were there..