Since a while I'm looking for something out of adult only and I really like to start something on youtube. So after a while searching for content that can be used to grow an yt channel - I got the Idea to buy high quality music (House, EDM) with full rights and publish them on yt and promote them with my sm power.
You all know these mixes on yt getting played over and over again and the audience is huge and always likely to share and come back listening over and over again (a tutorial video about how to make your pc faster will be never clicked twice by the same person for example).
Also music has also the option to publish on other plattforms to earn revenue - like spotify and Itunes.
Do you have that much budget to buy the music with full copyrights which can be reproduce on youtube ? Those brands are earning millions from their song and they won't give you any licensee for cheap. Its better if you grow on youtube with your own niche. I would simple reject this idea as it will involve too much cost and perhaps you won't be able to cover that cost.