About the word 'music'

Hi, there!

Please, which is the correct one?

1) In the sentence: " I love listen to musics", I suppose it's wrong to say this, isn't it? The correct should be: "I love listen to music" or "I love listen to songs", no? And by the way there isn't plural form for the word 'music', isn't it?;

2) "For different ages, there's a special music" (here I suppose the correct form is: "for different ages, there's a special song", because music refers to the style: rock, heavy metal, opera, while song is the music itself . Am I wrong?

3) "We all here appreciate Pink Floyd and Evanescence's music." (here I suppose the correct is: We all here appreciate Pink Floyd and Evanescence songs, without apostrophe's use . Or can I write ...Evanescence music?)

4) "They study hard at university." (I suppose it is : They study hard at the university);

5) When we know very well all the tasks(routine)of a job area, may we say: I know the duties of my area very well. (?)

Thanks,

Celine