Then Play On (remastered)

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A question... Bear in mind, the entire pre-Nicks era of Fleetwood Mac is pretty much foreign to me, although I'm familiar with a few songs, and know some of the history.

I'm listening to this new reissue of Then Play On, and in the booklet there is a write-up by David Fricke of Rolling Stone in it, and he says in the third paragraph "Then Play On was Fleetwood Mac's third studio album - and the only LP made in that lineup's supernova lifetime."

Who was new to this lineup, and thus I presume, only appeared on this album before departing?

Or was something else meant by that statement?

This is a great album so far. I'm only to Underway/Under Way (whichever is correct), and each track has been great except for When You Say, which I really didn't care for.