Idea for the next update of SONAR:
Marker Groups.
Make available different groups of markers.
For instance, I can create a "list" or "group" of markers for vocals (and colour them red) and another group of markers for guitar changes (and I could colour them blue) etc etc.
I would be able to display all of them at once via an enlarged (and resizeable) top bar (where they are displayed now) or one at a time.