Score-reading Hallucinations

As I listened to the music, the notes on the page were dancing to the music -- but at the same time, they were the music. It was so charming and graceful -- the flag of an eighth note extending like a ballet dancer's arm; pairs of notes, moving in parallel thirds and sixths, like dancers stepping hand-in-hand ... I was delighted!

Then, I got out the score of a Brandenburg concerto and put on a recording of it:

Unfortunately, as a beginner at reading scores, I couldn't integrate all the separate instrumental parts into a cohesive vision. It was just confusing and frustrating.