Kniaz' Igor'.

Prince Igor, or Kniaz' Igor', is an epic opera composed by Aleksandr Borodin, which remained unfinished at the time of his death in 1887. The work was completed and orchestrated by Nikolai Rimsky-Korsakov and Alexander Glazunov. This specific 1935 edition was published by the Bolshoi Theatre of the USSR, reflecting the opera's status as a cornerstone of the Soviet operatic repertoire during the mid-20th century.

The 1935 publication was produced during a period when the Soviet state heavily supported major classical productions to showcase cultural heritage. Borodin’s design for the work, based on the 12th-century Old East Slavic text The Tale of Igor's Campaign, aimed to blend nationalistic Russian themes with exoticized Eastern musical motifs. The publication was intended to standardize the libretto and score for use within the Bolshoi’s staging, which sought to balance historical narrative with the grand theatrical aesthetics favored by Soviet arts institutions of the era.