Hello

This in regards to the course Blues Style Level 1[br]The Notorious Key Of E[br]Can some one explane an open B7 chord.[br]My understanding is a B should contain [br]B, A and F notes. In a previous course[br]it was said to make a 7th you add the 7th note[br]and flatten it (1/2 step back).[br]B7 contains B, D#, A, B, and F#.[br]If A is the 7th note why is it not flattened.

Thanks

Ken