Question:  What do Ian Astbury and George Thorogood have in common?

Context paragraphs:
High Octane Cult: High Octane Cult is a United States and Japan greatest hits compilation featuring every single The Cult had released at the time, with the additional "Beauty's on the Street" and "In the Clouds".  It was released by The Cult's then record company Beggars Banquet Records without The Cult's participation.  In the years since its release, singer Ian Astbury and guitarist Billy Duffy have occasionally been vocal about their dislike of this release, with Astbury calling it "sad" on their official website in 2006.  Beggars Banquet had planned on using handmade drawings by Ian Astbury for the album's artwork, but when the drawings were lost, the record company subsequently replaced it with less than stellar car photos, and the band photo from The Cult's "Sonic Temple" record was used in the jacket sleeve, along with a short bio about the band, which guitarist Billy Duffy publicly expressed his disapproval about.

Better Than the Rest: Better Than the Rest is the third album (mini-album) of songs by George Thorogood and the Destroyers, recorded in 1974 and released in 1979.  At the time the songs were recorded, Thorogood was an unknown artist who was not signed to a record label.  In 1979, after Thorogood had released his first two official albums on Rounder Records, "Better Than The Rest" was released by MCA.  In 1986, the songs from this album were released on compact disc with the title "Nadine" using a different track order.

More George Thorogood and The Destroyers: More George Thorogood and the Destroyers is the fourth album by George Thorogood and The Destroyers, released in 1980.  An alternate name for the album is I'm Wanted.

BXI (EP): BXI is a collaborative EP by the Japanese band Boris and The Cult lead vocalist Ian Astbury.  The EP was released in September 2010 in CD, black, blue and pink vinyl, and digital formats through Southern Lord Records.  Boris and Ian Astbury had performed live together, including on May 30, 2010, at the Sydney Opera House and on September 7, 2010, at the Brooklyn Masonic Temple in Brooklyn, New York.

The Cult: The Cult are a British rock band formed in 1983.  Before settling on their current name in January 1984, the band performed under the name Death Cult, which was an evolution of the name of lead singer Ian Astbury's previous band Southern Death Cult.  They gained a dedicated following in the UK in the mid-1980s as a post-punk/gothic rock band, with singles such as "She Sells Sanctuary", before breaking mainstream in the United States in the late 1980s as a hard rock band with singles such as "Love Removal Machine" and "Fire Woman".  According to music critic Stephen Thomas Erlewine, the band fuse a "heavy metal revivalist" sound with the "pseudo-mysticism ... of The Doors [and] the guitar-orchestrations of Led Zeppelin ... while adding touches of post-punk goth rock".  Since the initial formation of Southern Death Cult in Bradford in 1981, the band have had various line-ups; the longest-serving members are Astbury and guitarist Billy Duffy, the band's two songwriters.

Ian Astbury: Ian Robert Astbury (born 14 May 1962) is an English singer and songwriter.  He is best known as a founding member and the lead vocalist for the rock band The Cult.

George Thorogood: George Thorogood (born February 24, 1950) is an American musician, singer and songwriter from Wilmington, Delaware.  His "high-energy boogie-blues" sound became a staple of 1980s rock radio, with hits like his original songs "Bad to the Bone" and "I Drink Alone".  He has also helped popularize older songs by American icons, such as "Move It on Over", "Who Do You Love? ", and "House Rent Boogie/One Bourbon, One Scotch, One Beer", which became staples of classic rock radio.

George Thorogood and the Destroyers (album): George Thorogood and the Destroyers is the self-titled debut album by American blues rock band George Thorogood and the Destroyers, released in 1977.  Consisting mostly of covers of blues hits, it included a medley of John Lee Hooker's "House Rent Boogie" and "One Bourbon, One Scotch, One Beer", the latter a song written by Rudy Toombs for Amos Milburn, and later covered by Hooker.

Holy Barbarians (band): Holy Barbarians was a short-lived rock band formed during 1996, after English frontman Ian Astbury left his band The Cult.  Astbury was joined with three musicians from the United States, guitarist Patrick Sugg along with brothers Matt and Scott Garrett.  Together the band recorded one album, "Cream".

A Gathering of the Tribes: A Gathering of the Tribes was a two-day music and culture festival organized by Ian Astbury and promoter Bill Graham, held in California in October 1990.  It is considered the precursor to the Lollapalooza touring festivals of the 1990s, an opinion shared by Astbury himself.  The festival was held at the Shoreline Amphitheatre in Mountain View on October 6 and the Pacific Amphitheatre in Costa Mesa on October 7.  The event was intended to raise money for and awareness of Native-American-related causes.  A performance by the American Indian Dance Theatre preceded the festival each day.  The concert grounds also hosted tents for Act Up, Amnesty International, Greenpeace, Rock the Vote, and local animal rights organizations.

Supporting paragraphs: Ian Astbury George Thorogood
Answer: singer and songwriter