Background: English rock band Led Zeppelin's untitled fourth album, commonly known as Led Zeppelin IV, was released on 8 November 1971 by Atlantic Records. Produced by guitarist Jimmy Page, it was recorded between November 1970 and January 1971 at several locations, most prominently the Victorian house Headley Grange. After the band's previous album Led Zeppelin III received lukewarm reviews from critics, they decided their fourth album would officially be untitled. This, along with the inner sleeve's design featuring four symbols that represented each band member, led to the album being referred to variously as , Four Symbols, The Fourth Album, Untitled, Runes, The Hermit, and ZoSo (which was derived from Page's symbol).
Context: In the lead-up to the album's release, a series of teaser advertisements depicting each symbol was placed in the music press. The album was a massive instant seller. It entered the UK chart at No. 10, rising to No.1 the following week and stayed on the chart for 90 weeks. In the US it stayed on the charts longer than any other Led Zeppelin album and became the biggest selling album in the US not to top the charts (peaking at #2). "Ultimately," writes Lewis, "the fourth Zeppelin album would be the most durable seller in their catalogue and the most impressive critical and commercial success of their career". At one point, it was ranked as one of the top five best-selling albums of all time.  Led Zeppelin IV received overwhelming praise from critics. In a contemporary review for Rolling Stone, Lenny Kaye called it the band's "most consistently good" album yet and praised the diversity of the songs: "out of eight cuts, there isn't one that steps on another's toes, that tries to do too much all at once." Billboard magazine called it a "powerhouse album" that has the commercial potential of the band's previous three albums.  Robert Christgau originally gave Led Zeppelin IV a lukewarm review in The Village Voice, but later called the album a "genre masterpiece", and wrote that it showed the band at the pinnacle of their songwriting. Even though he found their Medieval ideas limiting as usual, he said that it is "the definitive Led Zeppelin and hence heavy metal album". In his review for AllMusic, Stephen Thomas Erlewine credited the album for "defining not only Led Zeppelin but the sound and style of '70s hard rock", while "encompassing heavy metal, folk, pure rock & roll, and blues". In his album guide to heavy metal, Spin magazine's Joe Gross cited Led Zeppelin IV as a "monolithic cornerstone". BBC Music's Daryl Easlea said that the album made the band a global success and effectively combined their third album's folk ideas with their second album's hard rock style, while Katherine Flynn and Julian Ring of Consequence of Sound felt it featured their debut's blues rock, along with the other styles from their second and third albums. Led Zeppelin's Rock Hall biography described the album as "a fully realized hybrid of the folk and hard-rock directions". Music journalist Chuck Eddy named it the number one metal album of all time in his 1991 book Stairway to Hell: The 500 Best Heavy Metal Albums in the Universe.
Question: Anything else interesting?
Answer: "defining not only Led Zeppelin but the sound and style of '70s hard rock", while "encompassing heavy metal, folk, pure rock & roll, and blues".

Background: John Randall Hennigan (born October 3, 1979) is an American professional wrestler, actor and traceur, who currently wrestles for Impact Wrestling under the ring name Johnny Impact. He is best known for his tenure in WWE where he used the ring names John Morrison and Johnny Nitro. He is also known for wrestling in the independent circuit, Lucha Libre AAA Worldwide and Lucha Underground under the ring name Johnny Mundo. Hennigan was the winner of Tough Enough III, a televised competition that would award the winner a WWE contract, and was assigned to their developmental territory, Ohio Valley Wrestling (OVW), to continue his wrestling training.
Context: After leaving WWE, Hennigan began wrestling on the independent circuit under his real name, as well as his previous ring name John Morrison. On his first post-WWE wrestling appearance, Hennigan rekindled an old feud facing off against Shelton Benjamin in the main event of the World Wrestling Fan Xperience (WWFX) Champions Showcase Tour in Manila, Philippines on February 4, 2012. Hennigan won the match to become the inaugural WWFX Heavyweight Champion. On August 12, 2012, Hennigan appeared at Juggalo Championship Wrestling's Bloodymania 6 event, defeating Matt Hardy and Breyer Wellington in a three-way match. On January 25, 2013, Morrison appeared at Dragon Gate USA's Open the Golden Gate, defeating Akira Tozawa in the main event of the show. Hennigan took part in the WrestleMania weekend, wrestling for the Pro Wrestling Syndicate. On April 4, Hennigan defeated Elijah Burke and on April 5, Morrison defeated Japanese legend Jushin Thunder Liger in an "International Dream Match" at a Pro Wrestling Syndicate (PWS) event. On April 19, Hennigan again defeated Sami Callihan in a no count-out, no disqualification falls count anywhere match at a 2CW event in Rome, New York. The next day, he defeated Kevin Steen at 2CW's first iPPV (Living on the Edge VIII), in Watertown, New York.  On June 21, 2013, Hennigan defeated Carlito Caribbean Cool in FWE Welcome to the Rumble II, winning the FWE Heavyweight Championship. The next day, Hennigan defended the title against Too Cold Scorpio at House of Hardcore 2. On September 6 and 8, Morrison wrestled against WWL World Heavyweight Champion Black Pain for the title, but he was defeated both times. On October 12, 2013, at FWE Grand Prix, Hennigan defeated Matt Morgan, retaining the FWE Heavyweight Championship. On March 11, 2015, Hennigan lost the FWE Heavyweight Championship to A.J. Styles. Morrison faced Rob Van Dam at Pro Wrestling Syndicate in Rahway, New Jersey on October 24, 2015 in a winning effort. After the match, Morrison shook hands with Van Dam and led the crowd in an "RVD" chant.  On June 28, 2016, it was announced that Hennigan would make his debut for Pro Wrestling Guerilla in the company's annual Battle of Los Angeles tournament. He won his match against Matt Sydal in the first round, but was eliminated by Ricochet in the quarter-finals.  On November 16, it was announced that Hennigan, under his Johnny Mundo ring name, would appear for What Culture Pro Wrestling on their Delete WCPW event on November 30. Mundo was scheduled to face Alberto El Patron, but due to Alberto's absence he was replaced by Gabriel Kidd. At the event, Mundo cut a heel promo, insulting Alberto El Patron and the crowd, before defeating Kidd. On January 28, 2017, Morrison won a tournament at a 5 Star Wrestling event for his 5 Star Wrestling Championship, defeating Moose, Drew Galloway, and Rey Mysterio to retain the title. On June 2, Hennigan defeated Rob Van Dam to become the Pacific Coast Wrestling Heavyweight Champion. On September 22, Morrison reunited with former MNM tag team partner Joey Mercury after ten years, defeating Reno Scum.
Question: Did they ever face off against each other again?
Answer:
On August 12, 2012, Hennigan appeared at Juggalo Championship Wrestling's Bloodymania 6 event, defeating Matt Hardy and Breyer Wellington in a three-way match.