That is typical of the uninformed blather you often put out, Roger. The fact is that it doesn't have "opposite meanings in practice" by anyone who is knowledgeable in more than an ordinary way. That is not to say that everyone must be well schooled to enjoy the music. That is not the case. But when one tries to sit and act as though they are some kind of authority, as your posturing suggests, you only look foolish by trying to change what is generally accepted among practicioners of long standing, and scholars on the subject. Your suggestion that "source singers" are generally folks not skilled enough to perform the music demonstrates that you are quite chuffed with reading your own words, even if they are very foolish. These singers might often be unknown, but once discovered they are sought out, collected, and acknowledged for whom they are.

Mick