The release of any new Biosphere album is cause for celebration, especially when the man himself - the great Geir Jenssen - has chosen a specific theme or concept. 'Inland Delta', his first new full-length for almost two years, features (in his words) "mostly improvised performances on newly restored vintage keyboards". In practice, that means a slightly more colourful and fluid ambient sound than some of his many ambient albums, plus inherent warmth missing from his often icy compositions. There's plenty to set the pulse racing throughout, from the slow-moving cinematic bliss of 'Franklin's Dream' and the shuffling shimmer of 'Delta Function', to the becalmed, slowly unfurling dreaminess of 'The String Thing' and the Tangerine Dream-does-ambient loveliness of 'Florian's Flute'.