Maybe another suggestion could be useful as well....

Sometimes while choosing a style for my composition and going through the massive list (even filtered) of styles I want to listen how a particular instrument sounds in that style... So closing the stylepicker, using radio buttons on top, then going back to style picker is pretty much time consuming...

Since the style picker window is not resizable and there is available space in the right bottom part of the window, why not make some checkboxes for muting/soloing instruments there?