If you have an album with 12 tracks, and you want to send it to a friend via email or to upload it somewhere, what you'll do? You'll send the tracks one by one or you'll make a rar file and send it once?

Of course this was a rhetorical question, i know that you'll send 12 emails

im meaning on these download sites. And to send the 12 emails will takes twice the speed it will take sending one rar file as audio downloads 100 times faster than rar or zip

You have no idea about PCs and internet, eeh? What relation has the format of a file with the download speed? Nothing. You cant send an uncompressed file with MP3/pics etc, you must compress it as rar, zip etc. You save disc space with compressed files too, and you need less time to send a compressed file than an uncompressed one, coz the 1st is smaller in size.

Usually it is to combine the tracks into one file, along with tracklist and cover art, only point in doing it asmp3s can't be compressed any further

4th: open a book and read few things about net speed, compressing methods etc, coz its obvious that your knowledge is limited.....very......

Also some upload sites disallow certain file extensions (due to the possibility of copyright infringement etc.) therefore you can shove it in a zip or rar to get around this. Every mp3 file I've linked to or downloaded has always ended in the mp3 extension though, so you must be looking in the wrong places.

Also some evil people will hide a virus inside a rar file and name it with something desirable. Virus scanners built into browsers won't see there's a virus inside, so you can download it ok. As soon as you open the file and use it, you get infected. Sad but true

So, buy a serious antivirus and scan every compressed file while or after the downloading, is so simple