Amongst the shows at OTO over the next seven days, Iancu Dumitrescu, the enfant terrible of Spectral Music, returns for two evenings of primordial sounds and spectral explosions. The first evening will be dedicated to ensemble work and will be performed by the latest incarnation of the Hyperion Ensemble, consisting of some of the UK’s finest improvising musicians and conducted by Dumitrescu. The second evening, Charismatic Numbers, will be dedicated to small groups and will include a rare cello solo set played by Dumitrescu himself.