This was such a staple on progressive FM back in the 70's - the original Fleetwood Mac, Peter Green on lead guitar and vocals. Song is "Oh Well" parts 1 & 2.
Part 2 is rather special:
View: https://www.youtube.com/watch?v=uBH3kPfDq4k
And Christine McVie just passed away today
Another song written by Christine McVie and recorded by Fleetwood Mac - Little Lies:
View: https://www.youtube.com/watch?v=uCGD9dT12C0
Song: Bad Case Of Loving You
Artist: Robert Palmer