A free program for Android, by Aprender Limon.

Learn to Sing and Vocalize is a learning application that provides you with the tools to improve your voice and get a good sound. With this app, you can learn how to practice singing without straining your throat from home, with sheet music, and learn to sing and vocalize well like a pro. You can start singing at any age, but the younger you are, the easier it is to get a good voice and a good sound. This app will help you improve your voice and get a good sound, whether you are a beginner, intermediate, or advanced singer.

The course is made up of different exercises, such as learning the correct pronunciation of a word, identifying the different melodies, and learning the different musical genres. You can do this by following the instructions that are given to you.