Nils Frahm's latest must-check full-length excursion is not a brand-new work to mark Piano Day, the annual celebration of the instrument that made him famous, but rather an unheard collection from the vaults. It was recorded for Erased Tapes back in 2009, while he was still a student at the University of Performing Arts Graz, but for some reason they decided not to issue it at the time. It's Frahm at his minimalistic, spine-tingling best, offering up a swathe of solo piano pieces that veer from melancholic meditations, and immersive soundscapes, to genuinely cinematic compositions, yearning jazz interludes and - in the case of the brilliant 'Hammers' - gloriously uplifting workouts for vocal and piano.