THE forgettable 50s song might not have had too much to say for itself, but the concept had everything to say about Michael Frayn's multi-award winner which opened at the Lowry.

Copenhagen , a pick'n'mix play which combines quantum mechanics with philosophical challenge, fizzes and sparks across the auditorium like some expensive, new-fangled firework.

It centres on a factual meeting in 1941 when eminent German nuclear physicist Werner Heisenberg made a mysterious visit to Nazi-occupied Copenhagen to meet his Danish counterpart Niels Bohr.

The meeting turns into a catalyst whose chain reaction sets Frayn's imagination on fire. And it's full of haunting metaphors -- a snowflake gathers into a snowball and thunders doiwn the mountainside into an unstoppable landslide: small social dislocation becomes war.

Copenhagen is a three-hander, and Anna Carteret, David Horovitch and Alexander Hanson are the perfect messengers for Frayn's demanding despatch from the cockpit of history.

Copenhagen runs until Saturday.

COPENHAGEN

ROYAL NATIONAL THEATRE COMPANY

The Lowry, Salford