Musify is an excellent music batch download and conversion tool, developed by iTubeGo from Hong Kong in China. It can not only help users quickly download/extract high quality music from over 1000 online music/video sharing sites for offline listening, but also convert audio/video to various common audio formats for playback on different devices, so users don't need to bother about transcoding. Moreover, the conversion process does not lose the original audio quality.

MediaHuman Audio Converter is a free and cross-platform audio formats conversion & extraction program for Windows and Mac, developed by MediaHuman. It's written in C++ and Qt framework (for UI), and uses popular free software libraries like FFmpeg, OpenSSL, LAME, and TagLib.

Background music can be rated as the soul of a video, especially the soundtrack in a movie, many of which are classic. Most of the music in the film, however, is not available for sale as music albums. As a result, to get these soundtracks, we have to find a way to separate the audio tracks from a video file and save them as common audio formats, thus making it easier to enjoy these audio/music files alone on any multimedia devices.

In some cases, we would like to convert video to audio: e.g.:, For a recorded video of a great speech, now you only want to listen to it without looking at the picture; Turn whole TV series and movies into audiobooks; Extract pleasant but nameless background music from various video clips. At this point, we can use 4K Video to MP3 to convert video in any format into high quality audio file with one click.

4K YouTube to MP3 is a simple and practical video to audio conversion tool (its essence is to extract and save the audio track file from video) for Windows, Mac and Linux platforms. It can easily download video from all the popular media websites (such as: YouTube, SoundCloud, Vimeo, Dailymotion, Facebook, Flickr, Metacafe, and Tumblr), then automatically convert the video to MP3/M4A/OGG format of audio file and save to local disk.