It is usually wise to have some knowledge before opining. It is one of the fetishes of our time that the opinions of the uninformed and irrational are as valuable as those of the informed and rational.

If you think I preserve folk music in aspic you haven't heard me play.

If you think I play only folk music you haven't heard me play.

If you want to play strict tempo, you ought to know a quickstep from a waltz.