Asking me to change to SongRequests but still won't work after refactoring as such

package com.teamtreehouse;

import com.teamtreehouse.model.Song;
import com.teamtreehouse.model.SongBook;
import com.teamtreehouse.model.SongRequest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

/**
 * @author jonathanhector on 06.01.17.
 */
public class KaraokeMachine {

    private SongBook mSongBook;
    private BufferedReader mReader;
    private Map <String, String> mMenu;
    private Queue <SongRequest> mSongRequestQueue;

    public KaraokeMachine(SongBook songBook) {
        mSongBook = songBook;
        mReader = new BufferedReader(new InputStreamReader(System.in));
        mSongRequestQueue = new ArrayDeque <>();
        mMenu = new HashMap <>();
        mMenu.put("add", "Add a new song to the song book");
        mMenu.put("play", "play the song in the queue ");
        mMenu.put("choose", "Choose a song a sing");
        mMenu.put("quit", "Give up. Exit the program");

    }

    private String promptAction() throws IOException {
        System.out.printf("There are %d song available and %d in the queue. Your options are: %n", mSongBook.getSongCount(), mSongRequestQueue.size());
        for(Map.Entry <String, String> option : mMenu.entrySet()) {
            System.out.printf("%s - %s %n", option.getKey(), option.getValue());
        }
        System.out.print("What do you want to do ? ");
        String choice = mReader.readLine();
        return choice.trim().toLowerCase();
    }

    public void run() {
        String choice = "";
        do {
            try {
                choice = promptAction();
                switch (choice) {
                    case "add":

                        Song song = promptNewSong();
                        mSongBook.addSong(song);
                        System.out.printf("%s added! %n%n", song);
                        break;
                    case "choose":
                        String singerName = promptForSingerName();
                        String artist = promptArtist();
                        Song artistSong = promptSongForArtist(artist);
                        SongRequest SongRequest = new SongRequest(singerName, artistSong);
                        if(mSongRequestQueue.contains(SongRequest)) {
                            System.out.printf("%n%n Whoops %s alread requested %s!", singerName,
                                    artistSong);
                            break;

                        }
                        mSongRequestQueue.add(SongRequest);
                        System.out.printf("You choose: %s %n", artistSong);
                        break;
                    case "play":
                        playNext();
                        break;
                    case "quit":
                        System.out.println("Thanks for playing");
                        break;
                    default:
                        System.out.println("Unknown Choice");

                }
            } catch (IOException ioe) {
                System.out.println("Problem with the input");
                ioe.printStackTrace();
            }

        } while(!choice.equals("quit"));

    }

    private String promptForSingerName() throws IOException {
        System.out.println("Enter the singer name: ");
        return mReader.readLine();

    }

    private Song promptNewSong() throws IOException {
        System.out.print("Enter the artist's name: ");
        String artist = mReader.readLine();
        System.out.print("Enter the title: ");
        String title = mReader.readLine();
        System.out.print("Enter the url: ");
        String url = mReader.readLine();
        return new Song(artist, title, url);
    }

    private String promptArtist() throws IOException {
        System.out.println("Available artists");
        List <String> artists = new ArrayList <>(mSongBook.getArtists());
        int index = promptForIndex(artists);
        return artists.get(index);
    }

    private Song promptSongForArtist(String artists) throws IOException {
        List <Song> songs = mSongBook.getSongsForArtist(artists);
        List <String> songTitle = new ArrayList <>();
        for(Song song : songs) {
            songTitle.add(song.getTitle());
        }
        System.out.printf("Available songs for %s; %n", artists);
        int index = promptForIndex(songTitle);
        return songs.get(index);
    }

    private int promptForIndex(List <String> options) throws IOException {
        int counter = 1;
        for(String option : options) {
            System.out.printf("%d.)  %s  %n", counter, option);
            counter++;
        }
        System.out.print("Your choice: ");
        String optionAsString = mReader.readLine();
        int choice = Integer.parseInt(optionAsString.trim());

        return choice - 1;
    }

    public void playNext() {
        SongRequest songRequest = mSongRequestQueue.poll();
        if(songRequest == null) {
            System.out.print("Sorry there are no SongRequest in the queue. Choose choose from the menu to add some");
        } else {

            Song song = songRequest.getSong();
            System.out.printf("%n%n%n Ready %s ? Open %s to hear %s by %s %n%n%n",
                    songRequest.getSingerName(),
                    song.getVideoUrl(),
                    song.getTitle(),
                    song.getArtist());
        }
    }


}