Kidung Jemaat (KJ), Nyanyikanlah Kidung Baru (NKB) Pelengkap Kidung Jemaat (PKJ) Music sheet is an Android app that provides Indonesian notation forms of the popular hymn books KJ, NKB, and PKJ. This app is a useful tool for musicians, choir members, and anyone who wants to learn and play Indonesian Christian music.

The app has a simple and easy-to-navigate interface that allows users to search for a specific song and view its notation. The app also provides an option to change the font size of the notation for better readability. Moreover, the app has a feature that allows users to save their favorite songs for quick access. The app is free to download and use, making it accessible to anyone who wants to learn or play Indonesian Christian music.