Harmonia was a West German musical "supergroup"[4] formed in 1973 as a collaboration between members of two prominent krautrock bands: Cluster's Hans-Joachim Roedelius and Dieter Moebius joined by Neu!

"[2] In 1997, a series of shelved 1976 collaborations between Harmonia and British musician Brian Eno saw release as Tracks and Traces; it was reissued with more unearthed material in 2009.

In 1971,[5] the duo of Moebius and Roedelius, members of Cluster, moved to the rural West German village of Forst near the Weser River after being offered residence in several centuries-old farmhouses by an antiquarian who hoped to establish an artist's commune there.

"[4] Together the trio recorded in their own home studio in Forst, and chose the name Harmonia partially as a joking reference to the common German phrase for "choir.

Harmonia made their first live appearance in the UK on 18 April 2008, playing on the opening night of the Ether Festival in the Queen Elizabeth Hall at Southbank Centre, London.

According to AllMusic, the work of Harmonia was borne out of "relaxed, improvisational jam sessions that wedded Cluster's exploratory space music with the chugging rhythms and guitar sense of Rother.

"[9] Uncut named their two studio albums as "among the best Krautrock had to offer, gentler than Can or Faust, but with their shimmering keyboards and mechanical rhythms, every bit as compelling.

[10] Pitchfork labeled them "a key krautrock band because they brought together the most familiar strands of the sound and effectively perfected the whole," calling attention to their hybrid of electronic and rock instrumentation, long-form structures, and steady rhythms.

[6] According to Pitchfork, "copies of their records found their way into some famously open-eared and influential fans in the UK—Eno and Bowie, among others—and Harmonia’s music has been part of the experimental rock canon ever since.

Their work, according to critic Alex Abramovich, helped to lay the foundation "not only for ambient music but for generations of blues-less rock bands, from Wire and New Order to My Bloody Valentine.