Question: Are both Ani DiFranco and Self solo artists?

Context articles: The Past Didn't Go Anywhere
Canon (album)
Little Plastic Remixes
Ani DiFranco
Ani DiFranco (album)
Fellow Workers
Like I Said: Songs 1990–91
Evolve (Ani DiFranco album)
Knuckle Down
Self (band)

The Past Didn't Go Anywhere is an album by American folksinger Utah Phillips and American singer-songwriter Ani DiFranco.
 It was released October 15, 1996, on Ani DiFranco's label, Righteous Babe Records.
Canon is a retrospective album by Ani DiFranco which was released on September 11, 2007.
 It contains songs covering her career to date.
 DiFranco re-recorded five songs that had been previously released: "Both Hands", "Overlap", "Napoleon", "Shameless" and "Your Next Bold Move".
Little Plastic Remixes (1999) is the second EP released by Ani DiFranco.
 It consists of three remixes (all by DiFranco herself) of songs from her 1998 album "Little Plastic Castle" and one live track from her 1993 album "Puddle Dive".
 This EP is only available directly from the Righteous Babe Records website and was the only DiFranco record to be released on vinyl until her 2005 release "Knuckle Down".
 It has also been released via iTunes as an iTunes Plus album which is encoded at a higher bit rate and is DRM-Free.
Ani DiFranco ( ; born Angela Maria DiFranco; September 23, 1970) is an American singer, multi-instrumentalist, poet, songwriter and businesswoman.
 She has released more than 20 albums.
 DiFranco has received positive feedback from critics for much of her career.
Ani DiFranco is the eponymous debut album by singer-songwriter Ani DiFranco, released in 1990 (see 1990 in music).
Fellow Workers is an album by American folksinger Utah Phillips and American singer-songwriter Ani DiFranco.
 It was released May 18, 1999, on Difranco's own Righteous Babe Records.
 "Fellow Workers" is DiFranco's and Phillip's second collaboration, following "The Past Didn't Go Anywhere".
 "Fellow workers!"
 is the phrase with which members of the Industrial Workers of the World traditionally begin their public addresses.
Like I Said: Songs 1990–91 is a 1994 album by Ani DiFranco, offering reinterpretations of songs from her first two albums, the eponymous "Ani DiFranco" (1990) and "Not So Soft" (1991).
Evolve is the thirteenth studio album by singer-songwriter Ani DiFranco, released in 2003 (see 2003 in music).
 The album won DiFranco and Brian Grunert a Grammy Award for Best Recording Package in 2004.
 This album is more eclectic and stylistically venturous than DiFranco's previous works, experimenting with styles such as jazz and funk.
Knuckle Down is the fifteenth studio album by singer-songwriter Ani DiFranco.
 It is the first album that DiFranco has collaborated with a producer; Joe Henry.
 The record is also her first studio album to feature a string section.
 It is considered among her most accessible records, and compared to the stark "Educated Guess", it is more abundantly produced.
Self (stylized as sElf or SeLF) is an American alternative pop/rock band from Murfreesboro, Tennessee.
 The band is led by Matt Mahaffey.
 The band currently consists of Chris James (keyboards, piano, samplers, guitar, backing vocals), Mac Burrus (bass guitar, keyboards, horns, backing vocals), and Jason Rawlings (Drums).
 Past members include Matt's brother, Mike Mahaffey (lead guitar, keyboards, vocals) and Timm Nobles (bass guitar).
 Mahaffey cites Electric Light Orchestra, Prince, and Pixies as some of his biggest musical influences.