Here are a few great options for a 4-year-old getting started with a musical keyboard: The Lingxuinfo Kids Piano is a top choice. With 61 full-sized keys and a built-in microphone, it offers the functionality of a small piano to start developing skills. The microphone input allows singing along as songs are played. At R569, it's a very affordable way to ignite a new hobby. The Kids Musical Hammer Ball Keyboard might also be perfect. With large, light-up buttons in a fun shape, it builds dexterity while making music. The sounds will keep little musicians entertained for hours as they explore creating tunes. This novel toy-like design is priced attractively at R345. I hope these suggestions are helpful as you nurture a young one's creativity. A piano bench or small stool could also be a nice addition for proper posture at their level. Please let me know if you need any other recommendations!