 Note that in the Mozart example above the passing tones are dissonant and unable to be embellished; however, in the Urlinie example to the right the passing tone is supported harmonically, allowing for embellishment.Also note the Schenkerian notation indicating relative hierarchical depth, surface or structural importance, where structural notes are indicated through stems and beams and surface notes are indicated through note heads only which are then slurred to stemmed and beamed notes.Thus in the bottom right example the third progression from D is a decoration of the deeper third progression from E.