Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Wai pi wai (written as Yen Yen ) is an electronic music collaboration between Herman Klapholz (of Ah Cama-Sotz, Pow[d]er Pussy) and Jérôme Soudan (of Mimetic) which typically features downtempo experimental music, abstract, tribal, and breakbeat rhythms, overlayed with sweeping melodies composed with synths and pads. Overall, the music tends to sound organic and relaxed, finding different similarities between linked projects Pow[d]er Pussy, Mimetic, This Morn'' Omina or Ah Cama-Sotz. The first Yen Yen album, [wai pi wai] was released in 2004, with 11 tracks running 50 minutes. Tracks from [wai pi wai] were featured in compilations, including the track "Blue Voice", which was featured on Mixed Hands. The duo has also released a pair of original complation tracks, " Yen Yen (Versiune De La Maschinenfest Doua Mii Patru)" and "Elastic Break" which appear on Maschinenfest 2004 and Forms of Hands 2005 respectively. Their second release, a CD5" titled Beat Planet, was released on Hands Productions in 2006.