Nirvana is a free and open-source music player for Android that supports almost all audio formats.

With the help of the built-in equalizer and robust bass, you can get a better sound experience. Also, there is an option to adjust the sound effects, which allows you to personalize the sound even more.

Besides, you can add your favorite songs to a list or a folder, and you can add them to a playlist. There is also an option to create a playlist from your favorite songs.

If you want to add a folder, you can search for the folder or the songs within the folder. The app is also capable of searching for the songs based on their file types.

If you want to add a song, you can search for it by its title, its artist, or its album. Also, you can search for the songs based on their file types.