Daron Vartan Malakian (Armenian: Taron/Taron Vardan Malak`ean, born July 18, 1975) is an Armenian-American singer-songwriter, multi-instrumentalist, and record producer. He is best known as the guitarist, songwriter and second vocalist of the heavy metal band System of a Down and as the lead vocalist, lead guitarist and songwriter of the band Scars on Broadway. Daron Malakian is known for his distinctive playing and is ranked 40th in Loudwire's list of Top 50 Hard Rock + Metal Guitarists Of All Time and #11 in MusicRadar's poll, The 20 Greatest Metal Guitarists Ever.
Scars on Broadway
In 2003, Daron Malakian (lead guitar and vocals), Greg Kelso (rhythm guitar), Casey Chaos (vocals), and Zach Hill (drums) recorded a demo tape entitled Ghetto Blaster Rehearsals, credited to the name Scars on Broadway. However, in 2007, an official letter appeared on the band's website that stated that these tracks are not in any way affiliated with Malakian's later project Scars on Broadway. Incidentally, these demo sessions produced "B.Y.O.B.", which would be a major hit for System of a Down in 2005.  Following System's hiatus, Malakian announced his latest project - Scars on Broadway - a band which would include System of a Down bassist, Shavo Odadjian, and himself. Ultimately, Odadjian was not involved with the band, and instead System of a Down drummer, John Dolmayan became a member. After Malakian and Dolmayan experimented with different musicians (for a period of nine months in 2007 - 2008) the band took form and forged its sound in intense rehearsals and recording sessions (under Malakian's direction at his home studio and Sunset Sound) with musicians Danny Shamoun on keyboards, Dominic Cifarelli on bass, and Franky Perez on guitar and backing vocals for live performances (in the studio Malakian played nearly all the instruments with the exception of drums which were played by Dolmayan and some overdubs provided by the other members). The group released an eponymous album in 2008, which featured the hit single "They Say" (written by Malakian). However, shortly before the tour supporting the album, Malakian cancelled all scheduled concert and TV appearances, blaming a lack of enthusiasm and that his "heart wasn't into touring." This sudden cancellation prompted speculation and rumors that the band had broken up. It was the last that would be heard of Malakian for more than a year.  In August 2009, Scars on Broadway, minus Malakian, traveled to Iraq for a USO tour across the U.S. army bases. Their setlist consisted of covers as well as a few Scars songs. Guitarist/vocalist Franky Perez stated on his Twitter that "the Scars tunes sound amazing but they're not the same without D..." He also stated before they left that Malakian had given them his blessing. In 2009 Franky Perez mentioned on his Twitter that he and the D-Man (Malakian) were going into studio to jam, this was the first news people have heard about Malakian's whereabouts for about a year.  On May 2, 2010, Malakian reunited with Scars on Broadway at the Troubadour in West Hollywood. It was the first time he had performed with the band since October 2008. The group played songs from their album as well as new songs. Odadjian performed with the band for two songs, playing guitar.  On February 24, 2012, System of a Down announced that the Scars on Broadway website is back online featuring a preview of a new song called "Guns Are Loaded".

Q: When did he become a part of Scars on Broadway?
A: In 2003, Daron Malakian
How many people were a part of the group?
Scars on Broadway - a band which would include System of a Down bassist, Shavo Odadjian, and himself.
Scars on Broadway - a band which would include System of a Down bassist, Shavo Odadjian, and himself.