Use the YouTube Audio Library to get free, copyright-safe tracks to use in your videos! We’ve added hundreds of new music and sound effects already this year, available at https://www.youtube.com/audiolibrary And for more on how we’re thinking about Audio Library →https://goo.gl/dDq1Hu
Oh no! Once the videos have been deleted, you can't recover it through YouTube. If you still have the original file, you may re-upload it.