Lesson 4: How To Label Piano Keys Part Four - Piano Keyboard Layout (Black Keys). Here's part four in our series of piano lessons for beginners. For more, check out my Piano Lessons For Beginners' course at www.udemy.com/pianolessons (Watch lessons 1 to 3 first, to learn how to label the keys.) In this lesson, you will learn about enharmonic equivalents and the fact that every black key can have two note names (sharp or flat). | Piano-Keyboard-Guide.com