Question: The Art of Loss featured the Megadeth guitar player who released how many solo albums?
Context: The Art of Loss is the sixth studio album of Californian progressive metal band Redemption.  This is the first album without guitarist and founding member Bernie Versailles, who is presently on an indefinite medical leave of absence from the band because he suffered an aneurysm in October 2014.  To replace Versailles in the recordings, the guitarist and DGM member Simone Mularoni and former Megadeth guitar players Chris Poland, Chris Broderick and Marty Friedman were invited.  Vocalist John Bush from Armored Saint also was guest to sing "Love, Reign o'er Me", a cover of The Who in duet with Ray Alder. Ian Hunter is the first solo album by Ian Hunter, recorded following his departure from Mott the Hoople.  Released in 1975, it is also the first of many solo albums on which he collaborates with Mick Ronson.  The bassist, Geoff Appleby, was from Hull like Mick Ronson and they had played together in The Rats in the late 1960s. Martin Adam "Marty" Friedman (born December 8, 1962) is an American guitarist, known for his tenure as the lead guitarist for heavy metal band Megadeth which spanned nearly the full decade of the 1990s.  He is also known for playing alongside Jason Becker in Cacophony until 1989, as well as his 12 solo albums and tours.  Friedman has resided in Tokyo, Japan since 2003, where he has appeared on over 700 Japanese television programs such as "Rock Fujiyama", "Hebimeta-san", "Kouhaku uta gassen" and "Jukebox English".  He has released albums with several record labels, including Avex Trax, Universal, EMI, Prosthetic and Shrapnel Records. Dan Bárta (born 14 December 1969 in Karlovy Vary) is a Czech rock singer.  He was a founding member of Alice in 1990 (this band disbanded in 1997).  Later he was a member of short-lived band Sexy Dancers.  He also released many solo albums and albums with his band Illustratosphere.  He also starred in musicals.  Since 1994, he is also member of J.A.R. Franco Mussida (born in Milan, Italy, on 21 March 1947) is an Italian guitar player, composer, and singer.  He is best known as a founder and prominent member of the Italian progressive rock band Premiata Forneria Marconi (PFM), established in the early 1970s and still in activity.  An acclaimed guitar player, in 1984 he founded the Centro Professione Musica, a popular and jazz music academy, which is widely recognized as one of the most important schools in its genre both in Italy and abroad.  Besides working with PFM, Mussida has collaborated with a number of other musical acts and published three solo albums. Marcelo Barbosa (born in 1975) is a Brazilian guitar player and music professor.  He is a founder or member of a few important Brazilian bands like progressive metal act Khallice and former Angra vocalist Edu Falaschi's band Almah.  He also is a founder and an owner of a large musical institute in his home city Brasília called GTR, a columnist of the Cover Guitarra, Guitar Class and Guitar Player magazines and an Expo Music (Brazil) and NAMM (US) musical exhibitions participant.  Endorser of Tagima guitars.  Since September 2015, he is also Angra's touring guitarist replacing Kiko Loureiro, who is now a member of Megadeth. B.D. Foxmoor (born Michalis Mytakidis; Greek: Μιχάλης Μυτακίδης , on August 21, 1967) is a Greek rapper and hip hop producer.  In 1992 he founded Active Member and released the first Greek hip hop album, "Diamartyria" (Protest), in 1993.  In 1995 when Active Member signed to a major label, Warner, and released "To megalo kolpo", B.D. Foxmoor started referring to his music as low bap.  He has released many solo albums as well as LPs with Active Member and has also produced many releases of other low bap artists. David Denny (born February 5, 1948, Berkeley, California) is an American rock guitar player who was a founding member of Frumious Bandersnatch, a seminal psychedelic rock band from 1960s San Francisco.  Denny was a member of the Steve Miller Band, playing on 1977's "Book of Dreams", "Greatest Hits 1974-1978" (released in 1978, sold over 13 million copies), and 1993's "Wide River".  Denny wrote the hit song "The Stake," which was on the "Book of Dreams" and "Greatest Hits 1974-1978" albums.  While running a Mission District studio during the late 1980s, Denny contributed his guitar and vocal talents as a founding member of the Bombay Crawlers and played several Bay Area gigs with the swampy, powerful rock ensemble.  He later released two solo albums, 1991's Diesel Harmonics and 1997's Louisiana Melody.  David Denny and his ex-wife Kathy Peck (Executive Director and Co-founder of H.E.A.R. and former bass player with The Contractions) are artists, songwriters, film score composers, and music publisher owners of Monima Music. Roy Buchanan (September 23, 1939 – August 14, 1988) was an American guitarist and blues musician.  A pioneer of the Telecaster sound, Buchanan worked as a sideman and as a solo artist, with two gold albums early in his career and two later solo albums that made it to the "Billboard" chart.  He never achieved stardom, but he is still considered a highly influential guitar player. " Guitar Player" praised him as having one of the "50 Greatest Tones of All Time."  He appeared on the PBS music program "Austin City Limits" in 1977 (season 2). Andy Sneap (born 18 July 1969) is a British musician, songwriter, guitar player and record producer, best known as a successful Grammy winning producer with over 100 albums produced at his Backstage Recording studios in rural Derbyshire and as guitar player of British heavy metal band Hell.  He is one of the most active and successful music producers in the metal music genre and has worked with bands such as Accept, Saxon, Opeth, Amon Amarth, Arch Enemy, Exodus, Megadeth, Kataklysm, Kreator, Nevermore and Testament
Answer: 12