jquery Object Iteration with Alert

Can someone explain ho开发者_如何学JAVAw to iterate through all my object values with an alert?

// get a single audio url
echonest.artist("Prince").audio(function(audioCollection) {    
    $('#artistAudioURL').append(audioCollection.data.audio[0].url);         
});

With which object do need to iterate ? jQuery method for iterate is $(obeject).each( function() {} )