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In this add on you'll program a music playlist that users can change.

To start add music to your program.

Click the stage, select the sounds tab and choose sound from library.

Select the music loops category, select the sound then click the choose sound from library button again and select another.

Select as many tracks as you'd like to play in your program.

Select each track and name every track as a number, starting with one.

Next, start playing one of the tracks when the flag is clicked.

Drag out a play sound until done block.

Above that snap a when flag clicked block.

Click the flag to test.


Great, but the music plays only once.

It should keep playing.

To make the music keep playing place a forever block around the play sound until done block.

Test it out.


Awesome, the music repeats over and over.

Next, make the tracks change.

To change the music to the next track you need to tell the program which track to play.

Create a music variable.

Select the menu and click make a variable.

Variables hold values, like numbers or words.

In this example, the variable will hold the track number.

Name the variable music and click okay.

Place the music block in the play sound until done block.

Now the program will play the sound with the name that is in the music variable.

But right now, the music variable is zero and there's no track named zero.

Drag out a set music to zero block and change its value to one.

Place the block just after the when flag clicked block.

Click the flag to test it.

(guitar playing)

Great, it works!

Drag out a change music by one block to try changing the track.

(guitar playing)

(space music)

Cool, when the current track finishes playing the track changes.

Snap the when right arrow key pressed block on top.

To test it, click the flag then press the right arrow key.

(guitar playing)

(space music)

Cool, but the music variable will keep increasing forever and you don't have that many music tracks.

To make the music variable stop increasing after playing all the tracks, add an if then block around the change music by one block.

Place a less than block inside the diamond shapes base.

On the left side place a music variable block.

On the right side type the maximum number of tracks you have.

This example has four tracks.

Click the flag to test it.

Press the right arrow key multiple times.

(guitar playing)


Great, the music variable never goes beyond four.

Next program the left arrow to allow users to go backward through the tracks.

Right click the when right arrow key pressed block stack and select duplicate.

Change the dropdown to say left arrow key.

Change the green operator block to a greater than block.

On the left side, place a music variable block.

On the right side type one.

Type negative one in the change music by block.

Click the flag to test the whole thing.

(guitar playing)


(space music)


Pressing the right and left arrow keys changes the track but there's a bug in the program.

The music should change as soon as the user presses the arrow key not when the track finishes playing.

To fix the bug place a stop all sounds block above the change music by one blocks.

Test it out.

(guitar playing)

(space music)


(space music)

(guitar playing)

Great, the music changes immediately when the arrow keys are pressed.

Finally make sure your users know that they can control the sound in the program.

Click the paint a new sprite button.

Use the text tool to type instructions like, use the arrow keys to change the music.

Now everyone will know how to use the playlist you created.

Now it's your turn.

Add several music tracks to your program.

Program the sound to start when the flag is clicked.

All the user to change tracks by pressing the arrow keys using change by and stop all sounds blocks.

Finally, paint a new sprite to show off the music playlist feature.

Choose an Add-On

Fashion Playlist

Allow the user to choose the music your project plays.

More Models

Select a second model, and allow the user to switch between the two choices.

Add Sound

Add sound that plays each time the user clicks on the model.

Make an Entrance

Program your model to spin onto the stage.

Special Effects

Create an effect each time the user clicks the outfit.


  1. Choose an Add-On, and click "watch" to learn how to build it.
  2. Once you finish one Add-On, try another one below the video!