It is safe to say that the majority of Fleetwood Mac fans can be divided into two groups- those that favor the original Peter Green line-up and those that prefer the hitmaking Buckingham/Nicks machine. It is the rare bird who cites everything in between as their Fleetwood Mac music of choice. Sadly, there are many, I am sure, who simply do not know Fleetwood Mac music exists before "Rhiannon." With the loss of the great Danny Kirwan, there is no better time to discover his brilliant contributions to the band.
1969's "Then Play On" is a masterwork. While it would be irresponsible to credit only Kirwan for the giant leap in sound and style from the previous record, 1968's "Mr. Wonderful" it would be just as irresponsible to say that the wholly unique style and attack of "Then Play On" would have happened without Kirwan. I can't say enough about the music found on this record. There is nothing like it.
I've always felt that the Bob Welch years deserved more credit, but once Danny Kirwan left the band, the output becomes increasingly more difficult to stand behind. It was Danny Kirwan making the beautiful music that makes these "lost" records worth everyone's time.