Summvs is the fifth collaboration album between Alva Noto and Ryuichi Sakamoto. The collaboration between the artists began in 2002, and Summvs promises to be the fifth and final installment in the series titled the Virus Series. The title Summvs refers to the Latin word "summa" (eng. sum) and "versus" (eng. towards); it serves as a metaphor for the work being oriented towards a collaborative result. The album features "Microon" compositions containing recordings of a 16th tone interval tuning piano—Piano Metamorfoseador Carrillo en Dieciseisavos de Tono. The album also features two covers of the track "By This River" originally composed by Brian Eno, Dieter Moebius, and Hans-Joachim Roedelius in 1977.
The initial letters of the five albums in the series—Vrioon (2002), Insen (2005), Revep (2006), utp_ (2008), and Summvs (2011)—together form the word "Virus".
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