There’s lots of great reasons great reasons to customize the Admin Menu in WordPress. Here’s a couple of methods to do that:
1. Use a plugin like:
2. Modify your functions.php file (usually located in wp-content/themes/theme_name/):
3. Make a Plugin to do this:
Note: Number 3 above is part of a series: Customizing the WordPress Admin
Bonus: While writing this answer (originally on Quora), I learned about Easy Digital Downloads – which looks like a great plugin for eCommerce purposes (or artists & musicians)!!