Many of these posts are using their 20th century definition of "good" music to defend their tastes and put others down.
We need to discern God's definition of "good" music. In my study, I have not found a required form but a required content. Verses like "new song" and "decently and in order" seem far to generic. How do you know what you are doing (Psalms, Hymns, Choruses) fall into this category?