The book is comprehensive and detailed research of processes of Soviet music life still affecting Culture of Latvia in the most direct way. It considers different aspects of Semiology, Politology and Communication Sciences. The Monograph includes unpublished documents – correspondence about repertoire of Riga light music bands and A. Vinter's concerts in Latvia; materials of congresses of Composer' Union and auditing protocols of State Philharmonic. It also contains State archive materials of the period analysed by the author.