Instructions
Download "Mario Paint Composer" (see References), and save it to your desktop.
Right-click on the downloaded file, and select "Extract Here."
Open the "Mario Paint Composer" folder, and select "Mario Paint Composer."
Select the "New Song" button at the bottom of the screen.
Click "Yes" when you are asked to start a new composition without saving.
Type in a new name for your song in the text field to the left of the "New Song" button.
Use the "Scroll" button to move to the end of the arrangement. You are given 96 measures, but this can be increased.
Click on "Arranger" at the bottom of the page, and select the star "Add" button.
Click on the song again. In the text field to the right of the "Add" button, you will see the name of your song twice.
Click on the first name of the song to open up that part.
Right-click on notes on the composition that you do not want to delete.
Select "Imagery" from the top bar, and click on the musical staff to add new notes.
Select the second title listed in the text field to the right of the "Add" button.
Add notes to these measures as desired.
Click on the first title listed in this text field, and select the "Play" button to the left. Both of these titles will play, one after the other. This will give you up to 192 measures. You can click the "Add" button again to add more measures.
Select "Save Arrangement" at the bottom of the page.