A free app for Android, by hitesh56.

DJ Music Mixer is an all-in-one DJ software for Android phones and tablets. It has everything you need to mix and remix your favorite songs, from mixing to beat editing. The software has a built-in music library so you can add your own songs to mix with. You can mix songs using the built-in mixer with two virtual turntables and cross fade. It has a built-in sound effects and virtual DJ mixer. 

You can add two songs at a time to mix. If you want to add more than two songs you can mix two files at a time. You can also split a song in half and mix the two parts together. It has an equalizer and a volume slider. You can also use the equalizer to adjust the sound to your liking. There is also a playlist editor that allows you to edit your playlist.