I've heard that the first Bee Gees album is worth seeking out. I have still not done this (not sure which is the first, same as I heard about the Grateful Dead).
I have heard a local band cover a song from that first Bee Gees album and have been quite impressed. Then again I actually prefer their version of Dandelion to the Rolling Stones' version.
I acually owned it on vinyl!
(shhh, I'm pretty old)