EDIT: Sorry, my interpretation was wrong

Actually there is no difference, it's just a matter of style. Indeed you can say both "Ha incominciato a suonare la musica!" and "Ha cominciato a suonare la musica!" and you are speaking a good Italian. A similar sentence could be "Ha iniziato a suonare la musica!". It has the same meaning but it is less used. As I said before, it's a matter of style.

"olio di pesce in granuli" is what you need. For the pronunciation you have to stress "a", so you will read "gra'nuli"

You can use "mi" to emphasize the importance to the whole sentence, in this example with respect to you (because "mi" = "a me"). In English I would say "Don't come up with the servility", but there are two differences: - it is not emphasize as it is in Italian - In Italian the sentence is in 3rd person, while as I wrote it is in 2rd person Other example is: - "Non TE NE uscire con la solita scusa/storia", used in common speaking. A possible scenario is when a couple is arguing and one of them replies with the same excuse (same (old) excuse = solita storia).

You can use "mi" to emphasize the importance to the whole sentence, in this example with respect to you (because "mi" = "a me"). In English I would say "Don't come up with the servility", but there are two differences: - it is not emphasize as it is in Italian - In Italian the sentence is in 3rd person, while as I wrote it is in 2rd person Other example is: - "Non TE NE uscire con la solita scusa/storia", used in common speaking. A possible scenario is when a couple is arguing and one of them replies with the same excuse (same (old) excuse = solita storia).

"essere sempre in tempo" means you can always start doing something. You quit smoking and even if you gain some weight, you can always lose it. "essere (sempre) in tempo" is often used in common speaking.