The author of this article writes about the exhibition Mirror of Musical Baroque dedicated to the composer Johann Sebastian Bach, on the occasion of the 355th anniversary of his birth. The exhibition presents documents from the collection of the USARB Scientific Library: works in different editions, audiovisual documents, critical monographs in Romanian, Russian and foreign languages, articles from periodicals, appearances in reference sources. The online exhibition illustrates the main stages of his life, career and activity, summarizing the results and achievements of the composer.