On 21 March 2013, Tangerine Dream released their sixth studio album "Rubycon". It is widely regarded as one of their best albums. Rubycon further develops the Berlin School sequencer-based sound they ushered in with the title track from Phaedra.
Tom Moon includes Rubycon in his 2008 book 1,000 Recordings to Hear Before You Die, saying: "This voyaging vision of sound, ever-unfolding and not quite ever arriving, has been imitated endlessly since 1975. But somehow its admirers haven’t quite captured the openness and faraway grandeur of Tangerine Dream."
In his 1997 book Digital Gothic: A Critical Discography of Tangerine Dream, music journalist Paul Stump praises the album, noting: “Rubycon is simply a refinement of its predecessor—but to an acme of excellence, and demonstrates a mastery of primitive technology breathtaking in its audacity, tenacity and sheer artistic vision. It is probably the best album the band have made…”