And you also missed the following comment by reader Anonymous:
[Robert] Plant (Led Zep by extension) DID cover "Bits & Pieces" with Plant's version of Kenny Dino's 1961 single "Your Ma Said You Cried in Your Sleep Last Night," which the DC5 essentially rewrote as 'Bits and Pieces'."
He did it on 1990's "Manic Nirvana" album.
Well, knock me over with a feather...
...but sure enough it's true -- the 5 DID pretty much rip off the earlier tune. Granted, they added their own bridge section, but still; the provenance is pretty blatant.
As for Plant's version...
...it takes a little while to get going, but in the final analysis it does indeed have that real gone spirit.
Heh. The things you can learn on the intertubes.