The quality of education is currently considered to be a concern of the highest political priority. However, quality assurances of all kinds seem to be built on, and above all result in, a number of quantities. In this essay, I discuss the quality concept’s traditional and philosophical meaning and how it is being used today, but above all how our current understanding of “quality” may influence pluralism and diversity in education and music education. The worrying trends discussed in this essay are too complex to be solved with quick efforts by philosophers, researchers and/or teachers. Nevertheless, I illuminate some aspects of the issue, which are all in need of further discussions and analysis in relation to the area of music. I also indicate a number of philosophical concepts that can contribute to creating awareness as well as evoke some resistance.