Underground Sound of Lisbon (sometimes shortened to USL) was a collaboration between Portuguese house music producers Rui da Silva (then known as Doctor J) and DJ Vibe (real name Tó Pereira). It was active between 1993 and 2001.
The duo started working together in 1993 by founding Kaos Records, the first Portuguese electronic music label, with promoter António Cunha. They released their first record as Underground Sound of Lisbon, "Chapter One", in 1994, although at this time they also signed their production work as LHT (Lisbon Hard Team).
Still, the USL moniker became more famous after the track "So Get Up", a hard tribal anthem with spoken word apocalyptic comments by rapper Darin Pappas (better known by his stage name Ithaka, but credited here as Korvowrong), received airplay in New York clubs at the hands of DJ Junior Vasquez, which led to a worldwide release at the Tribal America label. They also produced a track with house diva Celeda on the vocals called "Are You Looking For Me"
In 1998, USL contributed "Hailwa Yenge Oike Mbela" to the AIDS benefit compilation album Onda Sonora: Red Hot + Lisbon produced by the Red Hot Organization.
By the late 90s their tribal house sound morphed into a more progressive and dreamy vibe. After the release of their final album, Etnocity, the duo officially enter a indefinite Hiatus, as both artists wanted to branch out into other fields and work with other producers. Da Silva relocated to London, where he set up Kismet Records and started touring the world over, while Vibe continued to tour worldwide and began working with up-and-coming Portuguese producers.
NYLX, was the name to a collaborative project between USL & Danny Tengalia. This is a one-track project released in 1997, the track being "GOOSEBUMPS".,
NYLX name appears as the junction of NY (for New York) and LX for Lisbon. The track uses a spoken vocal provided by Claudia Radbauer, also known as Lula (who as also provided some vocals for Club 69 or Sizequeen projects by Peter Rauhofer.)
It's Portuguese release on Kaos Records was a three track 12 inch single. Being A. Goosebums (The Kremlim Mix) B1. Goosebumps (The Poruguese Sound) B2 Goosebumps (Radio Edit). In the US release, on Twisted Records (U.S.), it was released a Maxi-single CD that featured the Portuguese Sound mix, the acapella, called here «Lula-pella» and its signature remix-version, a 15 minutes and 10 seconds long, by American producer Johnny Vicious. The Mushroom Head Mix.