As far as I understand, according to current copyright practices: If you sing a song that someone else has written, or pieces thereof, you are in violation. Thi

As far as I understand, according to current copyright practices: If you sing a song that someone else has written, or pieces thereof, you are in violation. This is also the case of you switch out the instrumentation completely, say play trumpet instead of guitar, or a male choir sings a female line. If on would make a medley many such parts, it is not automatically not violation anymore either. So we do have examples of things being very far from verbatim copy, being considered violations.