Karl Bartos (born 31 May 1952, Berchtesgaden, Germany) was, between 1975 and 1990, along with Wolfgang Flür, an electronic percussionist in the electronic-music group Kraftwerk. He was originally recruited to play on its US "Autobahn" tour. In addition to his percussion playing, Bartos was credited with songwriting on the Man-Machine, Computer World, and Electric Café albums and sang one lead vocal on the latter.

He left the group in 1990, reportedly^{[citation needed]} frustrated at the slow progress in the group's activities because of the increasingly perfectionist attitude of founding members Ralf Hütter and Florian Schneider.

In 1992 Bartos founded Elektric Music. This new project released the Kraftwerk-style Esperanto in 1993, and then the more guitar-based Electric Music in 1998. In between the two albums, Bartos collaborated with Bernard Sumner and Johnny Marr on Electronic's 1996 album Raise the Pressure, and co-wrote material with Andy McCluskey which appeared on both Esperanto and Orchestral Manoeuvres in the Dark's Universal album. In 1998, he also produced an album by Swedish synthpop band the Mobile Homes, much in the style of his work with Electronic: guitar-pop with very slight synthetic references. It was received as a great disappointment to synthpop fans, but it sold more than any of their previous albums and was used in TV advertisements for an airline to moderate success.

Benjamin Biolay (French pronunciation: [bɛ̃.ʒa.mɛ̃ bjo.lɛ]; born 20 January 1973 in Villefranche-sur-Saône, Rhône) is a French singer, songwriter, musician, actor and record producer. He is the brother of singer Coralie Clément, whose two albums he wrote and produced, and the ex-husband of Chiara Mastroianni, the daughter of Catherine Deneuve and Marcello Mastroianni.

His low-key vocal style is somewhat similar to French pop star Étienne Daho. With the singer Keren Ann, whose first two albums he co-wrote and produced, he contributed several songs to Chambre avec Vue, the successful comeback album of singer Henri Salvador, and has since worked as a writer, arranger or producer for other icons of French music, including Juliette Gréco, Julien Clerc and Françoise Hardy.

He wrote or performed most of the songs on the 2004 soundtrack to Clara et Moi by Arnaud Viard, and released the album Home with his wife the same year. After two more rock oriented albums in 2005 and 2007 he was dropped by his record company and began working on his first independent release, La Superbe, released on Naïve records in 2009.