The organ evening by Arno Hartmann will transform the works of Bach, Liszt, and Wagner into a cohesive musical narrative. The grand organ of the P. I. Tchaikovsky Concert Hall will take center stage this evening: a large-scale program featuring compositions by Bach, Liszt, and Wagner will be performed. Organist Hartmann will construct it as a single journey-from the strict Baroque to expressive Romanticism, where each piece logically follows from the previous one. The Bach section particularly showcases different facets of the composer. Transcriptions of fragments from the cantata "Ich hatte viel Bekümmernis" compel listeners to pay closer attention to the familiar score: instead of choir and orchestra, all lines are entrusted to the organ, and the polyphony emerges with rare clarity. Invention, chorale, and the Prelude in D minor complete this mosaic, while a fragment of exercises for the pedal keyboard emphasizes the virtuosic side of the style. In the second part of the program, the organ translates the language of Liszt's symphonic poem into its own scale. In "Orpheus," one can hear both transparent arpeggios and dense chord layers, as well as flowing melodic lines that gain a special sound density on the organ. The romantic breadth combines with the precise architecture of form, which is particularly interesting for listeners accustomed to the instrument as a church organ. The final emphasis will be placed on Wagner's music. The Pilgrims' Chorus, passionate "Dreams," and solemn excerpts from "The Mastersingers of Nuremberg" will be performed in organ versions by Liszt, Bossi, and Karg-Elert. These arrangements do not illustrate the operas literally but retell their language in a different timbre, allowing famous themes to be heard anew.