Problem playing a song

package com.teamtreehouse;

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Deque;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Queue;

public class KaraokeMachine {
  private SongBook mSongBook;
  private BufferedReader mReader;
  private Queue<Song> mSongQueue;
  private Map<String, String> mMenu;

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

  private String promptAction() throws IOException {
    System.out.printf("There are %d songs available and %d in the queue. Your options are: %n",
                      mSongBook.getSongCount(),
                      mSongQueue.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 artist = promptArtist();
            Song artistSong = promptSongForArtist(artist);
            mSongQueue.add(artistSong);
            System.out.printf("You chose: %s %n", artistSong);
            break;
          case "play":
            playNext();
            break;
          case "quit":
            System.out.println("Thanks for playing!");
            break;
          default:
            System.out.printf("Unknown choice: '%s'. Try again. %n%n%n",
                             choice);
        }
      } catch(IOException ioe) {
        System.out.println("Problem with input");
        ioe.printStackTrace();
      }
    } while (!choice.equals("quit"));
  }

  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 video URL: ");
    String videoUrl = mReader.readLine();
    return new Song(artist, title, videoUrl);
  }

  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 artist) throws IOException {
    List<Song> songs = mSongBook.getSongsForArtist(artist);
    List<String> songTitles = new ArrayList<>();
    for (Song song : songs) {
      songTitles.add(song.getTitle());
    }
    System.out.printf("Available songs for %s: %n", artist);
    int index = promptForIndex(songTitles);
    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() {
    Song song = mSongQueue.poll();
    if (song == null) {
      System.out.println("Sorry there are no songs in the queue. " + " Use choose from the menu to         add some");
    } else {
      System.out.printf("%n%n%n Open %s to hear %s by %s %n%n%n",
                        song.getVideoUrl(),
                        song.getTitle(),
                        song.getArtist());
    }
  }
}

Enter the artist's name: The Eagles                                                              
Enter the title: Hollywood Waltz                                                                 
Enter the video URL: https://www.youtube.com/watch?v=bsZCXx5WU3s                                 
Song:  Hollywood Waltz by The Eagles added!                                                      

There are 1 songs available and 0 in the queue. Your options are:                                
add - Add a new song to the song book                                                            
play - Play the next song in the queue                                                           
choose - Choose a song to sing!                                                                  
quit - Give up. Exit the program                                                                 
What do you want to do: choose                                                                   
Available artists:                                                                               
1.) The Eagles                                                                                   
Your choice: 1                                                                                   
Available songs for The Eagles:                                                                  
1.) Hollywood Waltz                                                                              
Your choice: play                                                                                
Exception in thread "main" java.lang.NumberFormatException: For input string: "play"             
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)         
        at java.lang.Integer.parseInt(Integer.java:580)                                          
        at java.lang.Integer.parseInt(Integer.java:615)                                          
        at com.teamtreehouse.KaraokeMachine.promptForIndex(KaraokeMachine.java:118)              
        at com.teamtreehouse.KaraokeMachine.promptSongForArtist(KaraokeMachine.java:106)         
        at com.teamtreehouse.KaraokeMachine.run(KaraokeMachine.java:61)                          
        at Karaoke.main(Karaoke.java:10)