Think you’ve heard Fleetwood Mac’s ‘Rhiannon’ before? Not until you hear this version from 1976, when the then 28-year-old Stevie Nicks and the band took the stage at Burt Sugarman’s The Midnight Special.  For many fans it is widely regarded as one of the band’s most critically acclaimed performances of their career. Watch this video and see if you agree! Here’s more about the song from Wikipedia: “Rhiannon” is a…