Drupal taxonomy

on the menus page (administer >> site building >> menus) you can create a menu item for your term. Select add item, and when you fill in the path field you add your category like this:

taxonomy/term/1

If your category "sonatas" is term 1, this would call for all the nodes of that category.

If your category "Bach" is term 2, you could call for only those sonatas written by Bach:

taxonomy/term/1,2

Or if Brahms is term 3 and you want to call for everything that has to do with either Bach or Brahms, you'd do it this way:

taxonomy/term/2+3