I don't know if I am ashamed of this, but it was bad. I saw the rock group Stories in concert in 1973. They had a big hit single that year, "Brother Louie". If you are old enough, you probably remember the chorus, "Louee Louee Louee Lou-eye."
They could not sing or play. They stood on the stage and moved around, and the singer opened his mouth, but nothing came out that any one could follow or understand. It was like gibberish, for the vocals and the instrument playing. After a few songs almost everyone in the audience left.