listening.js

// Configuration and API URL 
var username = "YOUR_USERNAME";
var api_key = "YOUR_API_KEY"; // To get an API key go to http://www.last.fm/api/account
var url = "http://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=" + username + "&api_key=" + api_key + "&limit=1&format=json&callback=lastTrackCallback";

// API call
function getCurrentTrack() {
    $.ajax({
        url: url,
        data: null,
        success: showCurrentTrack,
        dataType: "jsonp"
    });
}

// Returns the title of the song and the name of the album you're currently listening to
function showCurrentTrack(data) {
    var tracks = data.recenttracks.track;
    track = tracks[0];
    if (track && "@attr" in track && track["@attr"].nowplaying == "true") {

        $("#listening .track").html('<img src="http://assets.javierarce.com/eq.gif" width="12px" height="12px" />' + track.name + ' by ' + '<strong>' + track.artist["#text"] + '</strong>');
        $("#listening").addClass("active");
        $("#listening .track").delay(250).fadeIn(250);
    }
}