Make sure you name the songs correctly ("Record 1" up to "Record 16") (VERY IMPORTANT!)
They must be in a .ogg format, use an online converter or a program to change them if they are not in the correct format. (VERY IMPORTANT) (Should look like this: "Record 1.ogg") This is an advantage: if you want to share the songs privatly they are faster to send as they are smaller files.
(I suggest Audacity - Software I use) I have found this link too - http://audio.online-convert.com/convert-to-ogg. (This is just an example link and I am NOT responsible if anything happens to your computer or files if you click this link - Becareful when using these and don't give any personal information, make sure its a legitimate company too.)
Place you converted songs into the following directory INSIDE the MOD (Open the Jar file with 7Zip or WinRar): "assets/recordsmod/sounds/records".
Please tell me if there are any bugs through my website, http://arkif.webs.com or PlanetMincraft.com. (http://www.planetminecraft.com/member/arkif100/)
People will NOT be able to hear your music! They can only hear their music unless you both have the same music installed.
This is my first released mod so it may not be great.
Enjoy!
Thanks,
	Arkif100.

https://www.youtube.com/user/Arkif1/videos
http://arkif.webs.com
http://www.planetminecraft.com/mod/164-forge-your-records-mod-v-05-2888266/ - Should of downloaded it from here (In no circumstances should you have to pay!)