Once you read the dictionary everything else is just a remix by your own definition. > If it's fair use, I can train a voice model with Freddie Mercury's voice

Once you read the dictionary everything else is just a remix by your own definition. > If it's fair use, I can train a voice model with Freddie Mercury's voice This is where it falls down. If it's fair use you can train your AI using clips of his voice. It does not give you the right to then produce a sample similar enough to one of his songs and use it in your own (without royalties). But you absolutely can use your FM voice to sing your own song because voices can't be copywriitten.