iTunes.js

var iTunes = (function() {

    var endpoint = 'http://itunes.apple.com/search',
        searchOptions = {
            term: '',
            country: 'US',
            media: '',
            entity: '',
            attribute: '',
            callback: 'iTunes.end',
            limit: 50,
            lang: 'en_us',
            version: 2,
            explicit: 'Yes'
        };


    function doSearch(opts) {
        var search = $.extend({}, searchOptions, opts);

        $.ajax({
            url: endpoint + '?' + $.param(search),
            dataType: 'jsonp'
        });
    }

    function receiveResults(data){}

    return {
        search: doSearch,
        end: receiveResults
    }

})();