Question: Who was the band's manager when Black Sabbath released the album that featured the song "Changes"?

Context articles: Black Sabbath
The Best of Black Sabbath
Changes (Black Sabbath song)
The Black Sabbath Story, Vol. 2
Starless and Bible Black Sabbath
Vol. 4 (Black Sabbath album)
Hand of Doom (Black Sabbath song)
Heaven &amp; Hell Tour
The Collection (Black Sabbath album)
Godspeed (band)

Black Sabbath were an English rock band, formed in Birmingham in 1968, by guitarist and main songwriter Tony Iommi, bassist and main lyricist Geezer Butler, singer Ozzy Osbourne, and drummer Bill Ward.
 Black Sabbath are often cited as pioneers of heavy metal music.
 The band helped define the genre with releases such as "Black Sabbath" (1970), "Paranoid" (1970) and "Master of Reality" (1971).
 The band had multiple line-up changes, with Iommi being the only constant member throughout its history.
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").
"Changes" is a song by Black Sabbath.
 It first appeared on "Vol.
 4" which was released in 1972.
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.
Starless And Bible Black Sabbath is an album and song by the Japanese group The Acid Mothers Temple and the Cosmic Inferno.
 The album's title refers to the album "Starless and Bible Black" by King Crimson and the band Black Sabbath, and, more specifically, their self-titled debut album.
 The album cover also is very similar to the self-titled Black Sabbath album, except featuring group member Kawabata Makoto instead of a woman on the album cover.
Vol.
 4 is the fourth studio album by English rock band Black Sabbath, released in September 1972.
 It was the first album by Black Sabbath not produced by Rodger Bain; guitarist Tony Iommi assumed production duties.
 Patrick Meehan, the band's then-manager, was listed as co-producer, though his actual involvement in the album's production was minimal at best.
"Hand of Doom" is a song by the English heavy metal band Black Sabbath, originally appearing as the sixth song on their second album "Paranoid", released in 1970.
 It has been performed in many of Black Sabbath's live concerts.
 The lyrics were written by Geezer Butler while the music was written by the four members.
 "Hand of Doom" is accepted as one of the best songs on the album by many fans of Black Sabbath.
 It is the second longest song on the album behind "War Pigs".
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.
The Collection is a compilation album released by English heavy metal band Black Sabbath in 1992.
 The album was released on the label Castle, who released two CD versions of this album in the UK, both with the same cover art and songs.
 The album includes greatest songs of Black Sabbath with Ozzy Osbourne prior to his dismissal in 1979, from the eponymous album to "Never Say Die!
".
 The album has 15 tracks, two from "Black Sabbath", two from "Paranoid", one from "Master of Reality", two from "Black Sabbath Vol.
 4", two from "Sabbath Bloody Sabbath", two from "Sabotage", two from "Technical Ecstasy" and two from "Never Say Die!
".
Godspeed is an American metal band formed in 1992.
 Following the release of their debut album Ride on Atlantic Records, produced by Rachel Bolan of Skid Row, the band embarked on two high-profile tours as the opening act for Black Sabbath and Dio.
 Godspeed gained attention with an appearance on the 1994 Black Sabbath tribute album "Nativity in Black", on which they teamed up with guest vocalist Bruce Dickinson of Iron Maiden to record a cover of the Black Sabbath song, "Sabbath Bloody Sabbath."