I'm asking that because I made my own song recently and my boyfriend (who is a vocaloid producer) recommends I copyright my song so I can put it on bandcamp and sell it as a single. But my problem is that very question. Is it possible when you don't own the voicebank? My song uses Yokune Ruko Male Kire as the vocals, and they're in English (or in Engrish) [I do plan on doing a Japanese version too]. I'm aware that if I want to commercialize my song, I'll have to ask permission to use the voice, which I intend to do. I do also want people to cover it, like other songs, since I plan to release the instrumental too. But am I able to do that if I copyright it? I'm new to this, so I'm not sure how to do this. Any good tips or advice?