This laconic yet lasting statement from Terje Rypdal marked the Norwegian guitarist’s third ECM appearance as composer and leader. Its crucible continues to yield an enticing tincture of prog-rock and classical stylings for the weary musical mind. The reverberant French horn that animates “Silver Bird Is Heading For The Sun” betrays nothing of its cooption by a punchy g/d/b constituent. Floating on a well-aged mellotron, it bows out gracefully as Rypdal rolls in like a fuzzed haze.

Among the pleasures of this group of Rypdal reissues is the presence throughout of drummer Jon Christensen. Terje and Jon, lifelong friends, played on dozens of albums and in many groups together. Christensen always alluded to the trio with Terje and Danish trumpeter Palle Mikkelborg as heard on Descendre - as a particular favourite of his, an ideal instance of an interactive small group that could move in multiple directions. As drummer in the trio he could from moment to moment underline the melodic jazz phrasing of Palle Mikkelborg or rock out with Terje, find ways to combine their different time feelings, or strike out on his own. The three musicians could create highly atmospheric ensemble music, drifting clouds of sound sometimes with both Terje and Palle playing keyboards or develop freely contrapuntal ideas.

This end-of-the-millennium quartet session probably best defines all the inherent contradictions in who ECM attracts to the label – what kind of musician records for them – and what concerns these artists and ECM's chief producer (and creator) Manfred Eicher hold in common. This set, although clearly fronted by Markus Stockhausen and Arild Andersen on brass and bass, respectively, allows space for the entire quartet to inform its direction. Héral and Rypdal are not musicians who can play with just anybody; their distinctive styles and strengths often go against the grain of contemporary European jazz and improvised music. Of the 11 compositions here, four are collectively written, with two each by Andersen and Stockhausen.

A new ECM studio album and a programme of new music from Terje Rypdal is cause for celebration. On Conspiracy the great Norwegian guitarist seems to reconnect with the wild inspiration that fuelled such early masterpieces as Whenever I Seem To Be Far Away, Odyssey and Waves, exploring the sonic potential of the electric guitar with both a rock improviser’s love of raw energy and a composer’s feeling for space and texture. Keyboardist Ståle Storløkken, who contributed to Terje’s Vossabrygg and Crime Scene albums is an ideal co-conspirator, perpetually thickening the plot with his own intuitive feeling for complementary sound-colours. Conspiracy also marks a welcome return for Pål Thowsen, whose subtle, detailed drumming was last heard on ECM with Arild Andersen’s 1970s groups. Rypdal’s best band in years is completed by gifted young bass guitarist Endre Hareide Hallre. Conspiracy was recorded at Oslo’s Rainbow Studio and produced by Manfred Eicher and Terje Rypdal.