I believe that J.S. Bach wrote 6 Brandenburg Concertos:-

* Brandenburg Concerto No. 1 in F major, BWV 1046 * Brandenburg Concerto No. 2 in F major, BWV 1047 * Brandenburg Concerto No. 3 in G major, BWV 1048 * Brandenburg Concerto No. 4 in G major, BWV 1049 * Brandenburg Concerto No. 5 in D major, BWV 1050 * Brandenburg Concerto No. 6 in B flat major, BWV 1051

The cast of La cavalcata del capriccio - 1921 includes: Gina Busacchi Gino Gemignani Lea Lenoir Carmelita Mezzidolfi Evaristo Paccosi Carlo Restori Ubaldo Ricci Dorian Wild

F major, Bb major, Eb major, Ab major, Db major, Gb major and Cb major plus their relative minors.

The IV chord in the key of B flat would be E flat so the triad notes would be e flat, g, and b flat (on keyboard) for guitar it would be e flat, b flat, e flat, g,

b flat, and e flat. Played at the 11th fret as a bar chord in standard tuning.

Between A and B