She performed a duet with Jimmy Nail on his chart-topping single "Ain't No Doubt" in 1992 and appeared as the vocalist on Chicane's "Strong in Love" in 1998 (Chicane featuring Mason). She has also released a solo single with a cover version of the Diana Ross song "Touch Me In The Morning". Recently, she appeared as vocalist on two songs from Superchumbo's Wowie Zowie album.
Sylvia also sung on Scott and Leon's "Shine On", "Sounds of Eden" and "You Used To Hold Me". She has appeared as a backing vocalist on music by artists including Simple Minds, Robbie Williams, Cher, Bo Selecta, Swing Out Sister and Pet Shop Boys.
Sylvia has also toured extensively with Pet Shop Boys, including Live 8 Moscow in 2005 and is currently singing with the Boys on their 2006/2007 world tour.
2008 joining Roger Waters on his Dark side of the Moon tour.