Born in Brooklyn, Rojas toured the world with David Bowie from 1983 through 1987, playing bass on "Let's Dance", "China Girl", "Modern Love" and "Blue Jean".

King, Mick Jagger, Eric Clapton, Joe Bonamassa, Eric Johnson, Peter Frampton, Al Green, Carly Simon, Ian Anderson, Paul Rogers, Noel Gallagher, John Waite, Steve Winwood, Billy Joel, Herbie Hancock, Lee Ritenour, Julian Lennon[2] (Musical Director/Bassist), Richie Sambora, Robert Randolph, Joe Don Rooney, Trace Adkins, Nancy Wilson, John Hiatt, Carole King, Beth Hart, Bobby Womack, Sam Moore, Billy Squier, Rob Hyman & Eric Bazilian, Olivia Newton-John, Michael Hutchence, Bernard Fowler, Blondie Chaplin, Billy Gibbons, Leslie West, Joe Lynn Turner, Carlos Santana, Todd Rundgren, Patti LaBelle, Nona Hendryx, Michael Bolton, Ivan Neville, Allen Toussaint, Phil Ramone, Kevin Shirley, Trevor Horn, Charlie Sexton, Jewel, Brandy, Dave Mason, Mike Patton, Glenn Hughes, Nektar, Belouis Some, Tetsuya Komuro, Hitomi, Ziroq, Modern Primitives, Simranking, Sass Jordan, Alphaville and others.

in 1998, Rojas with Rock / Flamenco guitarist Marcos Nand sang lead vocals in both Spanish and English The both arranging & composing, formed the band Ziroq in Los Angeles.

"[3] A review by Mark Schwartz stated, "On their self-titled debut, Middle Eastern percussion, violin, and flamenco guitars take the fore, in counterpoint to Nand's smoky vocals."

[6] With Alphaville With Martin Briley With Joe Bonamassa With David Bowie With Bernard Fowler With Beth Hart and Joe Bonamassa With Nona Hendryx With Sass Jordan With Labelle With Julian Lennon With Dave Mason With Ryan McGarvey With Charlie Sexton With Belouis Some With Billy Squier With Rod Stewart With Steve Taylor With Tina Turner With John Waite