Part

Same directions for score, which depends on contextual level of detail needed. Note the instrument(s) that the part is for and if the piece is extracted from a wider score. Note: The example using "one flat key signature" is correct but it might be more accurate and representative to say "F major" or "D minor" key signature. However, this implies that the writer knows the key signature, so would be easier to keep the current example and let the user figure out based on other information available, which does present more complexity. A musician looking at a part would know the key signature based on the flats/sharps and the minor or major quality based on the note information, but a non-musician would not, so would depend on context for the image.