How to Label Piano Keys? [Pictures Included] - EnthuZiastic How to Label Piano Keys? 1. Use Colored Stickers 2. Use a Marker 3. Use Readymade Piano Stickers 4. Label the Keys that You Need 5. Label the Information that You Need: Notes, Notation, and Numbers Different Types of Piano Labelled 1. 88-Keys Piano 2. 76-Keys Piano 3. 61-Keys Piano 4. 49-Keys Piano Why Should You Label Piano Keys? 1.