Answer:
Written from my POV, and these are entirely my opinions.
Step-by-step explanation:
In my opinion, a world without singing, would be bland and depressing. Singing is a way to get emotions and feeling out, as well as a form of entertainment. Even in the Bible, singing was a form of praising God, and worshiping him. We are told to 'raise our voices and praise Him' this encourages singing. Before 900 A.D, people were said to have sung information to each other in a better way to remember it, so it could be transferred from one place to another.
I feel that a world without singing would be so very quiet and awkward. I am currently listening to music, with someone singing, while I write this. Some people feel the need to sing because they have suppressed emotions, and singing is a positive way to release them. Also, singing is fun! Especially in front of a crowd! As a singer myself, while I'm singing I am happy, singing makes me feel as if I have a purpose, and everyone needs a purpose. As for what the world would sound like, when running, I listen to music because I'd rather not listen to cars going by, or the children at the park. I want to focus on my run, and listen to music that boosts my mood.
(really had no clue what to write...I started writing then lost all motivation, sorry about that...hope this helps with whatever you needed!!)