If you go to the Louvre and look at the Mona Lisa, maybe you don't get "pleasure" from her smile, do you think to yourself that you know better than Leonardo DaVinci and repaint it? Alternatively you could try to appreciate and understand why DaVinci painted the Mona Lisa with that smile. That's the point of art, to try and understand the intentions of the artist, to experience what the artist is trying to convey. In my opinion, you are missing the whole point of art and music if all you want to do is reduce it to just "best possible pleasure". There's far more complex and stimulating emotional experiences to be gained from listening to music than just pleasure. Each to his own though.
G