Here's why:
* You can't count music like individual objects. You can't say "one music, two musics" because it's a general concept, not a thing you can count.
* It's treated as a singular noun. We say "the music is beautiful" or "music is my passion", not "the musics are beautiful" or "musics are my passion".
* You use "much" or "little" to quantify it, not "many" or "few". For example, "There is much music to enjoy" or "There is little music I dislike".
However, there are situations where "music" can be treated as countable. This is often when referring to specific pieces or genres:
* "I bought three new pieces of music." (Here, "music" is countable because it refers to individual pieces).
* "There are many different styles of music." (Here, "music" is countable because it refers to distinct genres).
So, while "music" is typically uncountable, there are exceptions depending on the context.