I'm not a professional musician (actually, I'm a computer programmer), but I'm playing Guitar and Recorder, and I also sometimes write some themes coming to my mind.

Thus, let's assume that I'm a little novice composer. Now, when a theme comes to my mind (or a simple motif), I start developing it, based on my intuition, and based on my sensational analysis. I only extend it, the way it sounds good to me. In other words, I don't follow any kind of musical form to extend (I can't find a better word for it) my theme into a more complete piece. 

On the other hand, when I give the extended song to my close friends, or my wife, or people close to me, they might like it, only based on its aesthetic value, not based on its musical and technical analysis. In other words, they say like "oh, it's beautiful".

However, when I try to put my song in a musical form, and to my opinion, make a highly technical piece, I feel that it looses its beauty (of course, IMO), and people around me say "the way before it was more beautiful". 

Now, I have a question. Should we follow musical forms? Why we have to confine ourselves to musical form at all? Isn't it true that we only create music, because of its aesthetic value? Does following form suppresses creativity in art, which in turn suppresses beauty and ingenuity of our work of arts?


Question: jQuery - Apply styling to all vertical TD in table on hover
Answer: To add a class for an entire column use td:nth-child(n) where n is the column number.  In your case, the columns you want to highlight vary from 2-4.  You also need to prevent the head, foot, etc. elements from being highlighted, so use .not().

$('table#prices tbody td:nth-child(3)')
  .not('.head,.price,.foot,.category_hover')
  .addClass('vertFilt');


So, for your situation, try this:

$('tr.catTr td').not('.category').hover(function(){

    var priceSel = $(this).index();

    $('table#prices tbody td:nth-child('+priceSel+')')
      .not('.head,.price,.foot,.category_hover')
      .addClass('vertFilt');

    ...

},function(){

    var priceSel = $(this).index();

    $('table#prices tbody td:nth-child('+priceSel+')')
      .not('.head,.price,.foot,.category_hover')
      .removeClass('vertFilt');

    ...