A free program for Android, by Artnode.ru.

The Pad Looper is a music player, mixer, and loop station, allowing you to mix and play your own recorded sounds and create your own musical compositions. The Pad Looper lets you use your Android device as a real DJ mixer, with two turntables and a microphone, so you can mix two songs together to create a new song. The mixing is a simple process, and the results are impressive. 

The Pad Looper is the easiest way to make a music player and mix two songs together. The program is not designed to make a professional music composition, but it can help you make a sketch of the track that was born in your head at that moment.