"Angel" is a song written and performed by 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...

 on the 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...

 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...

. Nicks attributed the song to the story of Rhiannon

Rhiannon

Rhiannon is a prominent figure in Welsh mythology, mother to the Demetian hero Pryderi and wife to Pwyll . She is probably a reflex of the Celtic Great Queen goddess Rigantona and may also be associated with the horse goddess Epona.She appears in both the first and third branches of the Mabinogi...

 in the Mabinogion

Mabinogion

The Mabinogion is the title given to a collection of eleven prose stories collated from medieval Welsh manuscripts. The tales draw on pre-Christian Celtic mythology, international folktale motifs, and early medieval historical traditions...

 and in particular Arawn

Arawn

In Welsh mythology, Arawn was the king of the otherworld realm of Annwn, appearing prominently in the first branch, and alluded to in the fourth. In later tradition, the role of king of Annwn was largely attributed to the Welsh psychopomp, Gwyn ap Nudd...

, who is the great lord of darkness.

"Rhiannon

Rhiannon (song)

"Rhiannon" is a single released by Fleetwood Mac in 1976. The song was written by Stevie Nicks."Rhiannon" was voted #488 in The 500 Greatest Songs of All Time by Rolling Stone magazine. Its US chart peak was in June 1976, when it hit #11...

", written in 1974 by Nicks (while still part of Buckingham Nicks

Buckingham Nicks

Buckingham Nicks is a 10-track LP by Stevie Nicks and Lindsey Buckingham. It was recorded in 1973 and was instrumental in both Nicks and Buckingham later joining Fleetwood Mac. A reissue of the album was done in 1976...

, and performed live by them on their solo album tour), and released on 1975's self-titled 'white' Fleetwood Mac

Fleetwood Mac (1975 album)

2004 Re-issueOn 24 March 2004, Warner Bros. Records re-released the remastered album, with the following bonus tracks:"Jam #2" – 5:41"Say You Love Me" [single version] – 4:03...

album, was also a successful single for Fleetwood Mac. However, that song was not based on the Welsh myth but a novel called Triad, by Mary Leader. It was only after "Rhiannon" was written that Nicks became aware of the myth.

"Angel" is also the title of a Fleetwood Mac song written by Bob Welch

Bob Welch (musician)

Robert Lawrence "Bob" Welch, Jr. is a former member of Fleetwood Mac, who had a briefly successful solo career in the late 1970s. His singles included "Hot Love, Cold World", "Ebony Eyes", "Precious Love", and "Sentimental Lady"....

, which appears on the (pre-Nicks and Buckingham) 1974 album, Heroes Are Hard to Find

Heroes Are Hard to Find

Heroes Are Hard to Find is the ninth studio album by British-American rock band Fleetwood Mac, released in 1974. This is the last album with Bob Welch, who left at the end of 1974, and was replaced by Lindsey Buckingham and Stevie Nicks. It was the first Fleetwood Mac studio album properly recorded...

.