Benjamin Grosvenor Bach's Partita No. 4, from Benjamin Grosvenor Operaomnia On The Bach Hour, in a performance described as having "drama," "vitality," and "swagger," the British pianist performs of the composer's Fourth Partita, and Ton Koopman directs the Cantata No. 96. Roth Conducts Beethoven's 5th Marco Borggreve Saturday, January 6, 20188:00 PM Benjamin Grosvenor is the soloist in Mozart's Piano Concerto No. 21, and François-Xavier Roth leads the BSO in Beethoven's mighty Symphony No. 5.