Nothing. They don't celebrate Christmas the same as us :)
The benefit of writing down one's music is so other people can repeat it. Like someone else can play your music
Answer: ofc peanut butter - in my opinion
The answer is (d.) choose only the visuals that are easily understood.
The main purpose of the visual aids is to help improve the understanding of the audience to the presentation. It clarifies and reinforce the key points of the topic. So it's important to choose the appropriate visual that could help the presentation easily understood.
