The Mist

Dias began his career in 1988 playing bass guitar for the Brazilian thrash metal band The Mist, which had just changed its name from Mayhem following a number of line-up changes. On the band's first album, Phantasmagoria, released in 1989, they most notably used their Chakal singer Vladimir Korg on vocals and boasted a twin guitar line-up displaying a progressive mix of aggressive thrash and gothic atmosphere. For the second album, The Hangman Tree in 1991, the former Sepultura guitarist Jairo Guedz took over full guitar duties for the band, reducing it to a four-piece while further expanding the unique sound of the first album. Korg left after the second album, further reducing the line-up to a trio for which Marcelo took over vocals for the third album, Ashes to Ashes, Dust to Dust, released in 1993, which showed the band adopting a more contemporary groove metal sound. Following this release, Dias left the band and was replaced by Cassiano Gobbet on both bass guitar and vocals for the final album, Gottverlassenin 1995, before splitting up in 1997.

Soulfly

Following this, Dias (a.k.a. Marcello D. Rapp) found international fame as the bass guitar player for the metal veteran band Soulfly. His collaborations in the band's first three albums (Soulfly, Primitive and 3) were essential and indeed established his professional level earning him certified RIAA gold records in the US as well in other countries, selling more than two million copies worldwide.

Soulfly incorporated many styles of metal with Brazilian tribal and world music. Dias's first three studio albums entered on the US Billboard 200, with a peak position at number 32 for the second album, Primitive.^[1] The band's first album, Soulfly, was certified gold by the RIAA.^[2]

Abloom

Dias with his bandmates Mikey Doling, Roy Mayorga and One Side Zero's Jasan Radford and Levon Sultanian, formed Abloom. Performing shows from California to New York, they quickly achieved national status for an unsigned band. With System of a Down bass guitarist's Shavo Odadjian as their executive producer, they recorded a full-length album on their own, with an open agenda to negotiate any future deals. Abloom is no longer active.

Against All Will

Dias' current band, Against All Will, consists of Puddle of Mudd's main songwriter Jimmy Allen on guitars, Jeff Current (Seven Story Drop) on vocals and Phillip Gonyea (Instinct of Aggression) on drums. The band finished its independent album, A Rhyme & Reason, in December 2009 and performed shows throughout the US in spring 2010.

In 2005, Dias appeared as one of the bass guitar players on the Roadrunner United compilation CD, The All-Star Sessions,^[3] with Fear Factory's guitarist Dino Cazares, Roy Mayorga (Stone Sour), Andreas Kisser (Sepultura) and many others.