Veljo Tormis's timeless compositions draw inspiration from Estonia's ancient history, and these evocations of the past, influenced by folk musics of the Baltic region, are often mesmerizing in sheer physical power. There is nothing else in contemporary choral music that can be compared with "Curse Upon Iron", where the fierce declamations of the Estonian Philharmonic Chamber Choir are underpinned by the pounding pulse of a shaman's drum. At such moments, Tormis's music seems possessed, and even the quieter episodes - such as the runo-songs performed by two young sopranos - have an hypnotic insistency.