I looked this up, I think it's definitely for those doing music degrees rather than those of us who struggle with Mustang Sally:
"Schenkerian analysis is an abstract, complex, and difficult method, not always clearly expressed by Schenker himself and not always clearly understood. It mainly aims to reveal the internal coherence of the work – a coherence that ultimately resides in its being tonal.In some respects, a Schenkerian analysis can reflect the perceptions and intuitions of the analyst."