Answer:
Honestly I would use all of them, but considering this is probably a text question and you can probably only choose one.... I's say.... Drawings or photo's on a page or screen. You need to look back at the question. It says to help people <em>visualize. </em>You wouldn't exactly be giving someone the best visualization experience if you read them text or made them read text. Also if it's just music, what's the person gonna visualize? I'd say yeah all those things can help <em>TO </em>visualize. But not really the best way to go about it.
Answer: Two
Explanation:
"A half note divided into two equal parts yields two quarter notes, which are each one quarter of a whole note, hence their name." - lcs productions
