What was the most important song of the Early Fleetwood Mac

[SteveMacD]

That depends. "Fleetwood Mac" is the song that gave the band its name, and probably lit the spark in Peter that lead to the ultimate formation of the group. That's pretty big. HOWEVER...

"Oh Well" could be argued to be their signature song. I think the only tours it wasn't played on since its release were the "Kiln House," "Dance," and SYW tours. It's be covered by quite a few artists, but is still thought of first and foremost as a Fleetwood Mac song. Fans always went crazy when they played it in concert. BUT...

"Albatross" was their first #1 hit in Europe, and was so big, the Beatles (yes, THOSE Beatles) were compelled to write "Sun King" as a bit of a tribute. It was so good, it hit #2 when rereleased as a single in 1973. STILL...

"Hypnotized" was really the first Fleetwood Mac song to get a lot of regular airplay in the USA, the market they had to crack to become what they became.

So, I'd say it's one of those songs. "Black Magic Woman" should get an honorable mention. It gave the band certain bragging rights it needed in that transition phase. However, by 1974, I think those may have been milked for all they were worth.