It can create a mood. To attract peoples attnetion, they must set a good mood. They can make it scary, happy or depressing but any of those will grab attention. This will get more people to see their content.
Music or sound can create all different types of mood for the audience because it makes it more interesting . For example if it is like a opera and dramatic music it will creates suspense to the audience but if its a up beat music it will create a happy mood for the audience.
