Challenges in Playing Bach's Music

In my recent talk together with Amanda Markwick, we delve into the question of what makes the music of J.S. Bach so challenging. 

For me, it's definitely the amount of stamina needed, mentally and physically. Playing Bach's music can feel like a test of how well we can coordinate all of our techniques to function together. We first need to have a concept about the music, then arrange all what needs to happen physically:
breath work and management – how we regulate our air to produce sound, just like singers do. In addition, Bach's music is notorious for us flutists because we're struggling to find good places to breathe! The question is - where and how to breathe? 
Articulation – Having our articulation contribute to the affect of the passage. Knowing early articulation methods is a key to that. 
Navigating difficult keys – Navigating through difficult keys is related to our breath, our embouchure, and coordination with the fingers. Bach wrote some of his greatest works for the flute in the worst keys for us. Think about “Zerfließe mein Herze” from his St. John Passion, or the E major flute sonata. (we don't even get a break in between - no comfort in C# minor!)

So all these physical elements need to function together, at the same time, on command to carry out our interpretation. That's a tall order! It IS a challenge but I also see it as motivation. Flute-playing is a physical activity and the practice of it (whether 'practicing' or performing) makes me feel strong and builds confidence in my body. I do enjoy feeling that physical aspect of the challenge and the reward it brings. 

Another challenge I see with Bach's music is simply finding those important clues which help us in our interpretation. It's like solving a jigsaw puzzle. Because of the common practice back then, things like dynamics and phrasing were mostly not given by the composer (unlike in later music). But that's Bach's trust in us that we're able to nevertheless understand his intentions. Or perhaps we can think of it like a game we play with Bach – he gives us some clues, can we get what he's talking about?