"Sisters of the Moon" is a song by Anglo-American rock group Fleetwood Mac

Fleetwood Mac

Fleetwood Mac are a British–American rock band formed in 1967 in London.The only original member present in the band is its eponymous drummer, Mick Fleetwood...

. It was written and performed by band-member Stevie Nicks

Stevie Nicks

Stephanie Lynn "Stevie" Nicks is an American singer-songwriter, best known for her work with Fleetwood Mac and an extensive solo career, which collectively have produced over forty Top 50 hits and sold over 140 million albums...

 and was released in the US as the fourth single from the 1979 album Tusk

Tusk (album)

Tusk is the 12th album by the British/American rock band Fleetwood Mac. Released in 1979, it is considered experimental, primarily due to Lindsey Buckingham's sparser songwriting arrangements and the influence of punk rock and New Wave on his production techniques...

. It was not a big hit and peaked at #86.

The song was not released in the UK, where "Not That Funny" had been released as a single instead. The rare 'single version' of "Sisters of the Moon" is included on the 2002/2009 compilation The Very Best of Fleetwood Mac

The Very Best of Fleetwood Mac

The Very Best of Fleetwood Mac is an enhanced compilation album released by rock band Fleetwood Mac in 2002 to promote their then-upcoming album Say You Will . It was released as a double album in the USA, and as a single disc in the United Kingdom. It debuted on the Billboard 200 album chart at...

.

When performed live, the song would usually go for over 8 minutes in length.
A very well known example of this performance is the Mirage Tour version, 1982. This video is regarded as one of Nicks' finest live performances by her fanbase.