Causal or correlational?

In the article Middle School Music Lessons Enhance Algebra Skills and the connecting comments, the question of what conclusions you kan make from statistics about what interventions has what effects is being raised. This article also shows the need for a more critical attitude toward studies that claim to have discovered causal effects. In most cases, the only thing you can really state is that you have correlation, unfortunately so many seek the easily explained that they exclude all other possibilities to what the results may infer …