Ranger's fixation with a few CD tracks used to drive me crazy, so I decided to teach him how to find the desired track again after it played.
We kept having problems because there are few good ways to describe the player's buttons to someone who (at that time) couldn't identify shapes or directions.
So, I put a sticker under the essential button. Ranger's now been locating his own tracks for almost a year. It's been great reinforcement for identifying numbers and counting as he knows his current favorite songs are tracks 1, 4, and 11 on CD 1.
Before kids, I wouldn't have dreamed of putting a sticker on electronics, but this strategically placed sticker offered Ranger greater musical independence and a gateway to numeric literacy. It looks pretty good to me.