Downloading DDR Songs to put on USB for ITG Machine

Hi, there! I'm a flailing noob, and I need help! >.<

I'm trying to find either a zip file with DDR Extreme songs already in .ogg format or I would like to learn how to conver .sm files to .ogg. I couldn't find a decent converter program or site that looked credible. I'm currently downloading a pack from: zenius-i-vanisher. com/v5.2/viewthread.php?threadid=5076

I've downloaded a bunch of songs from DDR Extreme and I'd like to put them on my USB to use at the arcade. I've been searching a lot of forums, but I'm still confused what all needs to be in the folder, clear cut. I put my USB in the machine and it downloaded the Song folder already.

In my song folder, it looks like this:

Afronova.mp3
Afronova.png
Afronova.sm
Afronova-bg.png

What is really necessary to have in the folder? Just the .ogg file? Do I need the mp3 file also?

Thank you and any help is greatly appreciated!

EDIT: The pack I downloaded has on ogg file attached, so I'm going to copy those to my USB and give it a shot at the arcade. Help is still welcome!
EDIT 2: Got it to work! Nevermind.