Question: Which lead vocalist wrote songs for Black Sabbath?

full_context: Document 1: Mob Rules (album): Mob Rules is the tenth studio album by English rock band Black Sabbath, released in November 1981. It followed 1980's "Heaven and Hell", and it was the second and last Black Sabbath studio album to feature lead vocalist Ronnie James Dio prior to the 1992 album "Dehumanizer".
Document 2: Psycho Man (Black Sabbath song): "Psycho Man" is a single by heavy metal band Black Sabbath. It was originally released on the "Reunion" album in 1998, and was the first of two new singles from the album, the other being "Selling My Soul." The song reached number 3 on the U.S. Mainstream Rock chart. The song was later included in Ozzy Osbourne's 2005 box set "Prince of Darkness". The music and lyrics were written by singer Ozzy Osbourne and guitarist Tony Iommi. Psycho Man and Selling My Soul are the only Black Sabbath songs to be credited just to these two members.
Document 3: The Best of Black Sabbath: The Best of Black Sabbath is a double CD compilation album by Black Sabbath released in 2000 on the Sanctuary Records label. Its 32 songs are presented chronologically from the band's first 11 albums, spanning the years 1970 to 1983. Black Sabbath's classic six-album run, from 1970s debut "Black Sabbath" through 1975's "Sabotage" is celebrated with three to six songs from each album. Original vocalist Ozzy Osbourne's subsequent final two albums with the band, 1976's "Technical Ecstasy" and 1978's "Never Say Die!", are represented by one and two songs, respectively. Replacement Ronnie James Dio's early 80's stint fronting the band on two albums is acknowledged with the title track of 1980's "Heaven and Hell" and a track from 1981's "The Mob Rules". The compilation closes with a song from 1983's attempted rebirth, "Born Again", former Deep Purple vocalist Ian Gillan's sole album with the band. "The Best of Black Sabbath" does not include any later material with vocalists Glenn Hughes (1986's "Seventh Star"), Tony Martin (1986–96) or the returning Dio (1992's "Dehumanizer").
Document 4: 13 (Black Sabbath album): 13 is the nineteenth and final studio album by English rock band Black Sabbath. The album was released on 10 June 2013 in Europe and 11 June 2013 in North America, via Vertigo Records and Republic Records in the US, and via Vertigo Records worldwide. It is the only studio album released by Black Sabbath since "Forbidden" (1995), and was their first studio recording with original singer Ozzy Osbourne and bassist Geezer Butler since the live album "Reunion" (1998), which contained two new studio tracks. It was also the first studio album with Osbourne since "Never Say Die!" (1978), and with Butler since "Cross Purposes" (1994), the first since "Never Say Die!" not to feature longtime keyboardist Geoff Nicholls, and the first since "The Eternal Idol" (1987) on the Vertigo label (outside the US and Canada).
Document 5: Seventh Star: Seventh Star is the twelfth studio album by English rock band Black Sabbath, released in January 1986. The release came at a difficult time as the group had just finished a highly contentious tour, experiencing conflicts within the band. With guitarist and songwriter Tony Iommi being the sole original member left, musicians Geoff Nicholls, Eric Singer, and Dave Spitz contributed to the album, playing keyboards, drums, and bass, respectively. Glenn Hughes, ex-Deep Purple bassist and vocalist, was
Document 6: Heaven &amp; Hell Tour: The Heaven & Hell Tour was the ninth world concert tour by Black Sabbath between April 1980 and February 1981 to promote their 1980 studio album, "Heaven and Hell." The tour marked the band's first live shows with vocalist Ronnie James Dio, who replaced original vocalist Ozzy Osbourne the previous year; drummer Vinny Appice, who replaced original drummer Bill Ward in the middle of the tour's North American leg after Ward suddenly left the band due to personal issues; and keyboardist Geoff Nicholls, who played keyboards on the "Heaven and Hell" album and accompanied the band on this tour as a sideman. For a portion of the North American tour, which was popularly known as the "Black and Blue Tour", Black Sabbath co-headlined with Blue Öyster Cult, with whom they shared a manager, Sandy Pearlman. The arrangement reportedly set attendance records but caused friction between the two bands as well as between Black Sabbath and Pearlman.
Document 7: The Mob Rules: "The Mob Rules" is a song by British rock band Black Sabbath from their 1981 album, "Mob Rules". The song was written by Ronnie James Dio and Tony Iommi. The song also released as the first single from the album.
Document 8: Never Say Die!: Never Say Die! is the eighth studio album by English rock band Black Sabbath, released in September 1978. It was the last studio album with the band's original lineup and also the last studio album to feature original vocalist Ozzy Osbourne until 2013's "13". It was certified Gold in the U.S on 7 November 1997 and as of November 2011 sold 133,000 copies in the United States since the SoundScan era. Critics called it unbalanced, scattering its energy in too many directions.
Document 9: Man on the Silver Mountain: "Man on the Silver Mountain" is the first single by Rainbow and the first track of their debut album, "Ritchie Blackmore's Rainbow". Written by guitarist Ritchie Blackmore and singer Ronnie James Dio, this song is, as Dio said, "a semi-religious one, a man on the silver mountain is a kind of God figure everyone is crying out to". This track became one of Rainbow's best-known tracks and was also a live favourite for any Rainbow line-up, and also the band Dio. The words "The man on the silver mountain Ronnie James Dio" are inscribed on his grave.
Document 10: Born Again (Black Sabbath album): Born Again is the eleventh studio album by English heavy metal band Black Sabbath, released in August 1983. It is the only album the group recorded with lead vocalist Ian Gillan, best known for his work with Deep Purple. It was also the last Black Sabbath album for nine years to feature original bassist Geezer Butler, and drummer Bill Ward, until he played the studio tracks on their 1998 live album "Reunion". The album has received mixed to negative reviews from critics, but it was a commercial success upon its 1983 release, reaching No. 4 in the UK charts. The album also hit the top 40 in the United States.
Document 11: The Black Sabbath Story, Vol. 2: The Black Sabbath Story Vol. 2 - 1978-1992 is a documentary video about the biography of the heavy metal band Black Sabbath. It is the follow-up to "The Black Sabbath Story Vol. 1 - 1970-1978", and it's about their story from the leaving of Ozzy Osbourne to the recording of Dehumanizer, discussing the line-up changes Black Sabbath experienced during the period between 1978 and 1992. In addition to comments by the storic members Geezer Butler and Tony Iommi, there are interviews with other people that have been in the band, like Ronnie James Dio, Ian Gillan, Cozy Powell and Vinny Appice. There are also live clips and video clips of various songs. In 2002 a DVD Version has been released, with 19 min of never-seen footage, not included in the previous VHS Version.
Document 12: Mr Crowley: "Mr Crowley" is a song by British heavy metal vocalist Ozzy Osbourne about English occultist Aleister Crowley. It was first released on Osbourne's debut solo album "Blizzard of Ozz" in September 1980 in the United Kingdom, and then a live version of the song was released as a single in November 1980. The song was written by Osbourne, guitarist Randy Rhoads, and bass guitarist/lyricist Bob Daisley.
Document 13: The Eternal Idol: The Eternal Idol is the thirteenth studio album by English rock band Black Sabbath, released on November 23, 1987. It is the first Black Sabbath album to feature vocalist Tony Martin. It spent six weeks on the "Billboard" 200 chart, peaking at 168. It was also the last full album of new material by Black Sabbath to be released by Warner Bros. Records (in North America), and the final album through their original label Vertigo Records until the release of "13" in 2013.
Document 14: Ronnie James Dio: Ronald James Padavona (July 10, 1942May 16, 2010), better known by his stage name Ronnie James Dio, was an American singer, songwriter, and musician. He fronted and/or founded numerous groups including Elf, Rainbow, Black Sabbath, Dio, and Heaven & Hell. He is credited with popularizing the "metal horns" hand gesture in metal culture and was known for his medieval-themed lyrics. Dio possessed a powerful versatile vocal range capable of singing both hard rock and lighter ballads.
Document 15: Diary of a Madman (album): Diary of a Madman is the second solo studio album by British heavy metal vocalist Ozzy Osbourne. It was released on 7 November 1981, and re-issued on CD on 22 August 1995. This is the last Osbourne studio album to feature guitarist Randy Rhoads and drummer Lee Kerslake. An altered version appeared in 2002 with the original bass and drum parts removed and re-recorded. In 2011, a "Deluxe 30th Anniversary Edition" was released with all original parts restored. To date, the album has sold over 3 million copies worldwide.
ground_truth: Ronnie James Dio