Opus 30-Skrjabin ten complete Piano sonatas offer a fascinating insight into the Russian composer s stylistic development. While his first works still fully reflect the late-romantic tradition the late works keep bursting thebounds of tonality. The boldly outlined two-movement Fourth Sonata marks a turning point for it evokes the world of the Poème de l extase with its mystical atmosphere hovering between ethereal raptureand ecstatic flight. The publication of opus 30 means that all of Skrjabin s sonatas are now available in Henle Urtext quality and edited by the expert Valentina Rubcova of Moscow an invitation to all pianists to plungeinto this unique cosmos.