input: In February 2011, Napalm Death appeared in an episode of E4's Skins. Napalm Death entered Parlour Studio in Kettering, with producer Russ Russell to begin working on a new album. Also in 2011, they recorded the single "Legacy Was Yesterday". Napalm Death released their fifteenth studio album, Utilitarian, on 27 February 2012 in Europe and 28 February in North America via Century Media. In March 2012, Napalm Death headlined the Metal Mayhem IV festival organized by "Defenders of Metal" in Nepal. This was the first time Napalm Death played in Nepal.  Napalm Death were scheduled to play a special one-off show at the Victoria and Albert Museum in London, on 22 March 2013. The show was eventually cancelled at the Victoria and Albert Museum, due to concerns that the noise levels could damage parts of the museum. The show was relocated to the De La Warr Pavilion in Bexhill, and was performed on 29 November 2013. The performance was a collaboration with ceramicist and Victoria and Albert Artist in Residence Keith Harrison. The show featured 10 large-scale wooden speakers filled with liquid clay that were left to solidify. When the band began to play, the clay inside the speakers was expected to vibrate, causing the speakers to crack and eventually explode. The actual performance was considered anticlimactic, as the speakers withstood the sonic vibration.  In April 2014, the band released a cover of the Cardiacs' song "To Go Off and Things" via Bandcamp. All proceeds from the single went towards Cardiacs frontman Tim Smith's recovery from a simultaneous heart attack/stroke he suffered in 2008. The band announced on 5 November 2014, via Facebook that due to an illness in the family, Mitch Harris would be taking a hiatus from the band, to be replaced by various guitarists on their tour. Napalm Death's sixteenth studio album, Apex Predator - Easy Meat, was released on 26 January 2015. On 4 July, a Nepal Charity Event track from the Apex Predator sessions called "Earth Wire" was released on their page.

Answer this question "Did the show go well?"
output: The show was eventually cancelled at the Victoria and Albert Museum, due to concerns that the noise levels could damage parts of the museum.

Question: The Wildhearts are an English rock group, formed in 1989 in Newcastle upon Tyne. The band's sound is a mixture of hard rock and melodic pop music, often described in the music press as combining influences as diverse as The Beatles and 1980s-era Metallica. However, this characterization is denied by the band, who see their influences as being far broader, as shown in the song "29 X The Pain", which lists many of group leader Ginger's influences. Despite several top 20 singles and one top 10 album in Britain, the Wildhearts have not achieved major commercial success, owing in part to difficulties with record companies and many internal problems often relating to recreational drugs and depression.

In early 2001 Ginger announced that he was reforming the Earth vs the Wildhearts lineup of the band for a tour later that year. This lineup (consisting of Ginger and CJ on guitars and vocals, Danny McCormack on bass and vocals, and Stidi on drums) soon ran into difficulty due to McCormack's battle against heroin addiction, and on several dates of the comeback tour Toshi (from support band AntiProduct) stood in as bassist. By 2002 McCormack was once again clean and the band started recording a new mini-album and also toured the UK. The tracks intended for the album were released in the UK in late 2002 across three formats of the "Vanilla Radio" single, and as the mini-album Riff After Riff After Motherfucking Riff in Japan. "Vanilla Radio" reached the top 30 in the UK singles chart, and in early 2003 work began on a full-length album. However, during recording, McCormack checked himself into a rehabilitation center to deal with an alcohol problem, leaving Ginger to play the bass parts on the songs that were newly recorded for the album. McCormack's place in the live band was filled by "Random" Jon Poole, who had already worked with Ginger on his Silver Ginger 5 side project.  The album The Wildhearts Must Be Destroyed, released in 2003, had a very commercial sound, full of short simple pop songs with little of the heavier rock style which often featured on previous albums. The band also managed to get a US record deal with Gearhead Records, which released Riff After Riff in 2004, a compilation of songs from the UK post-reformation singles (all of the songs from this release are also found on the Gut Records compilation Coupled With). Riff After Riff was the Wildhearts' first US release since Earth vs the Wildhearts in 1994. The release was also promoted by a tour, mostly as the support band for their ex-support band, The Darkness.  Then in early 2005, Ginger dissolved the Wildhearts again, citing a mixture of his own personal problems and a lack of commitment within the band. He briefly joined the Brides of Destruction before setting out on his own as a full-time solo artist. In typically unpredictable Wildhearts style, Ginger then reformed the Wildhearts once again for a one-off gig at Scarborough Castle (Rock In The Castle) in September 2005. The 1994-1995 line-up of Ginger, C.J., McCormack, and Ritch Battersby played at this gig.  Once again, the Wildhearts reformed in December 2006 and played a single live show at the Wulfrun Hall in Wolverhampton. This line-up saw Ginger joined again by C.J., Ritch Battersby and a new bassist, Scott Sorry (ex-Amen). This line-up soon became official, with plans made for a new album in 2007.

Using a quote from the above article, answer the following question: What caused McCormack to need to get clean?
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