Background: Audio Adrenaline is an American Christian rock band that formed in 1986 at Kentucky Christian University in Grayson, Kentucky. The band gained recognition during the 1990s and received two Grammy Awards and multiple Dove Awards. Audio Adrenaline were regular performers at the annual Creation Festival, Spirit West Coast festival, Agape Music Festival, and Alive Festival. In 2006, the group disbanded due to lead singer Mark Stuart's spasmodic dysphonia.
Context: On January 18, 2006, Audio Adrenaline announced that they were retiring from active music ministry and cited Stuart's "ongoing vocal challenges" stemming from vocal cord damage as the primary factor. On July 27, 2006, the band played at the popular Christian music Creation Festival, where they had performed every year since the group formed, for the last time with their original lineup. On August 1, 2006, they released their final compilation album, Adios: The Greatest Hits, a farewell album containing two new tracks as well as a selection of the band's greatest hits to date.  For their final national tour in early 2007, Audio Adrenaline opened for MercyMe on their "Coming Up to Breathe Tour". The band performed their last live concert on April 28, 2007, at the Waikiki Shell in Honolulu, Hawaii. Their final project, which was released on August 28, 2007, is a live CD-DVD combo entitled Live From Hawaii: The Farewell Concert. The album earned two nominations at the 39th GMA Dove Awards, winning Long Form Music Video of the Year. The group's reunion performance was at Easterfest '09 in Queens Park, Toowoomba, Australia.  After the band's retirement, their members dedicated their time to other projects. Mark Stuart and Will McGinniss started a project called Know Hope Collective, which features a changing group of musicians singing worship songs and presenting testimonies. They both have also been working extensively with The Hands and Feet Project in Haiti. Tyler Burkum has been playing for several bands and as a session musician. He also started his own band called The Leagues. Ben Cissell ran a skate club/youth ministry venue called Rocketttown, and then started pursuing film work. Finally, Bob Herdman has been working as a Project Manager for several companies in the Nashville area.
Question: What happened in 2007?
Answer: their final national tour in early 2007,

Problem: Background: Robert Ervin Howard (January 22, 1906 - June 11, 1936) was an American author who wrote pulp fiction in a diverse range of genres. He is well known for his character Conan the Barbarian and is regarded as the father of the sword and sorcery subgenre. Howard was born and raised in Texas. He spent most of his life in the town of Cross Plains, with some time spent in nearby Brownwood.
Context: In August 1930 Howard wrote a letter to Weird Tales praising a recent reprint of H. P. Lovecraft's "The Rats in the Walls" and discussing some of the obscure Gaelic references used within. Editor Farnsworth Wright forwarded the letter to Lovecraft, who responded warmly to Howard, and soon the two Weird Tales veterans were engaged in a vigorous correspondence that would last for the rest of Howard's life. By virtue of this, Howard quickly became a member of the "Lovecraft Circle", a group of writers and friends all linked via the immense correspondence of H.P. Lovecraft, who made it a point to introduce his many like-minded friends to one another and encourage them to share stories, utilize each other's invented fictional trappings, and help each other succeed in the pulp field. In time this circle of correspondents has developed a legendary patina about it rivaling similar literary conclaves such as The Inklings, the Bloomsbury Group, and the Beats.  Howard was given the affectionate nickname "Two-Gun Bob" by virtue of his long explications to Lovecraft about the history of his beloved Southwest, and during the ensuing years he contributed several notable elements to Lovecraft's Cthulhu Mythos of horror stories (beginning with "The Black Stone", his Mythos stories also included "The Cairn on the Headland", "The Children of the Night" and "The Fire of Asshurbanipal"). He also corresponded with other "Weird Tale" writers such as Clark Ashton Smith, August Derleth, and E. Hoffmann Price.  The correspondence between Howard and Lovecraft contained a lengthy discussion on a frequent element in Howard's fiction, barbarism versus civilization. Howard held that civilization was inherently corrupt and fragile. This attitude is summed up in his famous line from "Beyond the Black River": "Barbarism is the natural state of mankind. Civilization is unnatural. It is a whim of circumstance. And barbarism must always ultimately triumph." Lovecraft held the opposite viewpoint, that civilization was the peak of human achievement and the only way forward. Howard countered by listing many historical abuses of the citizenry by so-called 'civilized' leaders. Howard initially deferred to Lovecraft but gradually asserted his own views, even coming to deride Lovecraft's opinions.  In 1930, with his interest in Solomon Kane dwindling and his Kull stories not catching on, Howard applied his new sword-and-sorcery and horror experience to one of his first loves: the Picts. His story "Kings of the Night" depicted King Kull conjured into pre-Christian Britain to aid the Picts in their struggle against the invading Romans, and introduced readers to Howard's king of the Picts, Bran Mak Morn. Howard followed up this tale with the now-classic revenge nightmare "Worms of the Earth" and several other tales, creating horrific adventures tinged with a Cthulhu-esque gloss and notable for their memorable use of metaphor and symbolism.  With the onset of the Great Depression, many pulp markets reduced their schedules or went out of business entirely. Howard saw market after market falter and vanish. Weird Tales became a bimonthly publication and pulps such as Fight Stories, Action Stories and Strange Tales all folded. Howard was further hit when his savings were wiped out in 1931 when the Farmer's National Bank failed, and again, after transferring to another bank, when that one failed as well.
Question: What is Lovecraft Circle?
Answer:
a group of writers and friends all linked via the immense correspondence of H.P. Lovecraft,