I can't create or include binary content like PNG files directly in my response, as this would require binary data that can't be represented as text. 

For the default-cover.png file, you'll need to:

1. Generate a simple placeholder image using an image editor
2. Save it as "default-cover.png" in the "discord-jukebox-bot/pkg/web/static/" directory

Alternatively, you could:

1. Use a base64-encoded data URL in your JavaScript to represent a default image
2. Update the app.js file to include a fallback image directly in the code

Would you like me to update the JavaScript to include a base64-encoded default image instead? This would eliminate the need for a separate PNG file.