Did you happen to download a shader mod recently? I experienced the blocky look after installing a shader mod but luckily there is a way to fix it (if that is the case) otherwise I'm not too sure and can only suggest re-installing/re-downloading or switching your Rendering System.Aah, ok. Also, I meant to actually manage to 'add' music to weather.
Not exactly sure what you mean by timing music to weather, could you explain with a little more detail? ^^"
There are lots of particles here that may interest you: www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.0 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.0)