If you schedule the videos to be posted for peak traffic hours, you can optimize your audience. High profile followers on both Facebook and YouTube obviously follow a lot of other pages and channels, meaning that if you don’t post during the time they’re online, you risk your video getting lost in their newsfeed. Beyond that, assuring your followers see your name and videos at least once every day in their newsfeed will make them feel like they know you personally. Scheduling the posts can also make your life a little easier.
If, in a given week, you have one day that you can complete two or three music videos and two days you don’t have time to make any, you can schedule the release of the two or three you did over the few days you're busy and seem like you're active on social media more frequently.