sentences:  Schulz' second album, "Progression" (released 2007) featured a new collaboration with Kelsey, "On a Wave".In 2006, Kelsey was approached by dance producer TTLC, also known as TDR (Tom de Ridder), to collaborate on electro track "Never Ever".This track was released by Belgian label Mostiko and has culminated in DJs such as Judge Jules and Sasha championing the Filterheadz remix (live and on their weekly shows on BBC Radio 1), as well as the Housetrap mix receiving heavy air rotation on Belgian national radio.