I’m rarely disappointed by a Pierre Audi production and his Tristan und Isolde for Teatro dell’opera di Roma, recorded in 2016, was far from that. It’s a bit of a slow burn but then so, really, is the work itself. It’s starkly simple. The sets contain few elements and no fuss. Costuming is almost drab but the direction of the singers is compelling and it builds to a brilliant staging of the Liebestod with Isolde silhouetted, motionless in a kind of frame and absolutely nothing happening which, paradoxically, is riveting.