How to combine two controllers in Angular.js?

I'm new to Angular, and I've got two seperate controllers that work fine separately, but when I try to combine them in the same page, on of them gets broken. You can check them out here:

http://plnkr.co/edit/RUKCNUsiLLHja5BCsOXi?p=preview

http://plnkr.co/edit/UkGEaquNkXGfUgbuYBki?p=preview

I've tried to combine both controllers like this:

var app = angular.module('App', ['audioPlayer'], [ngSocial]);

But that breaks it as well. Do you think it has anything to do with the Ionic framework I'm using?

Thanks for any help!

EDIT: Here's the working demo http://plnkr.co/edit/0eQZ0O?p=preview

Could you show the third example where it actually breaks. It looks like you should have:

var app = angular.module('App', ['audioPlayer', 'ngSocial']);

If you're actually talking about combining modules. The first parameter to angular.module is the string name of the module you're defining, the second parameter is the array of dependencies.