Subterrania Mosaic Edition Subterranea is the debut album from six-piece British ensemble Mosaic, led by the 2015 Kenny Wheeler Jazz Prize winner, British vibraphonist Ralph Wyld. The seven tracks are all compositions by Wyld, expansive and bold, mostly allowing space for intensive improvisation, especially from the leader’s vibraphone. Much of the ensemble work is led by James Copus’s trumpet or flugelhorn, while Sam Rapley’s bass clarinet murmurs an undertow or takes off into a solo, driven along by Scott Chapman’s inventive percussion. Cryptogram is a good introduction to the group’s style, with its breaks into stop/start passages as percussion works energetically and the ensemble moves into a semiclassical mode using Cecilia Bignall’s cello. The cello also features in the beginning of the closing track, Reprise, leading the group into a spreading sequence for trumpet to take over the lead. The title track opens mysteriously with a single-note vibes pattern, before the subdued ensemble arrives to build an intro for Misha Mullov-Abbado’s quick moving bass solo, which in turn leads into a silky solo from bass clarinet. Many of these tracks open with a semiclassical style arrangement, and Kaira Konko — the longest at more than 12 minutes — follows that opening approach before moving into a repetitive trumpet passage and melodic solo with a richly coloured ensemble backing. There are ghostly beginnings too to Interlude 1 and Interlude 2, emphasising the cello and multiple orchestral effects, reinstating echoes of the classics, and both tracks are devoid of anything resembling a jazz solo. The unified finale, Reprise, revisits several of the other tracks and draws them together for a fitting conclusion.