How to make a record

I am curious as to how to do that too but the only way I can think of to do it is to look at the Minecraft source code decompiled and look at how the music disks work and work from there in your own mod, but I haven't even figured out how to decompile the source code with forge ect. myself and I doubt you know anymore than I do. Maybe this comment might be a little helpful but your best answer will probably come when someone else gets here.

Also that would require some Java knowledge as well, obviously

Check the issue tracker, this is planned to be added.