Stevie Nicks, casts her inviting incantations over the Top 40 airwaves

For the week ending June 14, 1980, "Sisters of The Moon", Fleetwood Mac's 4th and final single released from "Tusk" peaked at No.86 on the Billboard Hot 100. The single only lasted 3 weeks on the chart which is the poorest showing in terms of weeks on the Hot 100 chart for any of their singles released that made it onto the chart 

Maybe the track isn't the most radio friendly, but it's still a great track... Cash Box got it right with their review:

The great white witch of Fleetwood Mac, Stevie Nicks, casts her inviting incantations over the Top 40 airwaves once again on this edited re-mix of the track from the "Tusk” LP. Lindsey Buckingham's guitar notes cry out like a banshee in the night, rising to a fever pitch at the cold close. Mysterious and marvelous, this is prime Mac. - Cash Box 1980