DOWNLOAD Partita in B-flat Major No. 1 by Johann Sebastian Bach (published in 1731) . High quality classical piano scores from the Piano Street sheet music library. Johann Sebastian Bach, one of the prominent composers active in the Baroque era, has written this piece titled Partita No. 1 in B-flat Major from Partitas. The composition is categorized as "Polyphonic, Suite" in Piano Street's sheet music library and the level of difficulty is 8+.