When Bob Welch suddenly left Fleetwood Mac in 1974, Mick Fleetwood needed to find a replacement as soon as possible.
He'd heard of a young guitarist performing in Los Angeles, named Lindsey Buckingham. He offered Buckingham Welch's spot in the band.
Buckingham agreed with one condition - his girlfriend and writing partner, 26-year-old Stevie Nicks had to come along too.
Fleetwood eventually agreed to offer the position to both Nicks and Buckingham at the end of 1974, where the also joined Christine and John McVie.
From there Fleetwood Mac went on to write and record the classics, Over My Head, Monday Morning and Rhiannon.
They introduced themselves to the world in May 1975 as the 10th and by far most successful version of Fleetwood Mac to a crowd in El Paso, Texas.