how to break multiple Ajax promise chain?

I have multiple ajax request working together, and each request based on previous request's result, if the previous request return false, the chain should stops.

Here's some code

 //here is a promise chain    

 return this.getBand(id)
            .then(this.getAlbum)
            .then(this.getSong);
//ajax request for getBand
function getBand(id) {
  return Ember.$.ajax({
    data:{id: id},
    url: urls.bandUrl,
  }).then(function(result){
    return result;
  });
};

//ajax request for getAlbum
function getAlbum(result){
  if(result.pass) {
  var bandName = result.name;
  return Ember.$.ajax({
   //...
  })
  } else {
  // i wanna stop the promise chain here, how to do that?
  }
}