- (RACSignal *)getPlaylist {
  return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
    [[[buttonClickSignal
      flattenMap:^(UIButton *sender) {
          return [self logInWithUsername:username password:password];
      }]
      flattenMap:^(NSDictionary *json) {
          return [self fetchPlaylistForToken:token];
      }]
      subscribeNext:^(NSDictionary *json) {
        [subscriber sendNext:json];
        [subscriber sendCompleted];
      }];
      return nil;
  }];
}