Let AppNee tell you a fact, most of excellent BGM (background music) only can be found in some short videos or movies, which you can't search or download from any other places. At this point, we have to manage to extract the audio tracks from these videos. Directly converting video to audio formats always makes us feel unreliable, although extracting audio tracks is likely to be just a high-quality format conversion. In a word, "extract" always sounds better than "convert" to guarantee the quality of audio, isn't it?