You can use my tracks for private, non-commercial purposes, for example rehearsals at home. You can also use my tracks to make your own cover but only if you post your cover on YouTube, properly credited, ad-free and without monetization. Please inform me once you have uploaded your video.
Credits must be given in the video itself and in the description of that video. The correct way to credit me is:
"Backing track by Aberforth D, www.thesoundofopera.com"
Alternatively you can showcase your talents on Smule where I also post my backing tracks. In that case I strongly recommend that you first practice on YouTube before recording on Smule.
It is not allowed to publish your cover anywhere else than YouTube or Smule. Public performance without my explicit prior permission is strictly prohibited and I will not grant permission for commercial use.
The reason I am so strict about non-commercial use is that I make my tracks available for free. I do not sell my videos and my channel is free of ads. I do not want people to make money out of something that is given to them for free. Of course, the implicit self-promotion by placing your cover on YouTube is perfectly fine and even encouraged.