Grouping isn't available in the Playing Now list ?
If you want to group other lists by the containing folder, you first need to create a new library field, then group by it...
Create a new field:
In the top toolbar, click on Tools, then click on Options.
From your choices down the left hand side, choose "Library and Folders"
Second from the bottom on the right, choose "Manage library fields". A new dialogue opens...
Click on the "Add new field" button and you will be prompted for a name for your field. Enter a name, Directory, perhaps...
Next, select the "Calculated data" radio button, leave everything else at default.
Paste the blue text into the "expression" field: =ListItem([Filename (path)],Math(ListCount([Filename (path)],\)-1),\)
Press the OK button to accept field changes, press the OK button to accept option changes.
Now, when you choose to group by your new "Directory" field, your list will be grouped by containing directory.
-marko.