Teaching is complex, dynamic, and constantly changing. So-called checklists for lesson observation are therefore not always helpful for instrumental and vocal teachers. Volume 5 of the Grazer Studies for Instrumental and Vocal Pedagogy now conveys four areas of competencies in a playful and artistically designed card set, which is intended to stimulate a scientifically based exchange about the quality of instrumental teaching and learning. In the context of music (high) schools, the cards offer concrete entry points and imaginative ways to reflect on the complex, overlapping competencies associated with teaching and learning music and observing and developing instrumental and vocal teaching. In addition, the cards provide a playful basis for self-directed and self-regulatory feedback in collegial exchanges. Both students of instrumental and vocal pedagogy and experienced teachers can continually cultivate their individual teaching profile. Practical worksheets in this accompanying booklet support reflection on new perspectives. Reflect! also proves valuable in observing videotaped teaching sequences.