Users can view the library in only one way that they prefer. Number of columns, and the column pivots could be modified. But it would be great to have different views of the same library at the same time. A typical example of this is the "smart view" function of WinAmp. User can define as many views as they like (the could be a limitation of 5) and whenever they switch between the views, they get filtered views sorted in different ways. This would be a great addition to Ario (which is already a very good MPD client).