FonePaw Screen Recorder is so versatile that it can record audio files as well. And not only general audio, but also music on YouTube, Spotify, or other music that you can't download.
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For example, if you are going to record music on YouTube, just follow the steps:
Step 1 Launch the software and choose Audio Recorder.
Step 2 Adjust the system sound. Meanwhile, open the YouTube page that you are going to record.
Step 3 Click the REC button to begin and click the Play button on YouTube.
When you finish the recording, click the red square button to stop.
Step 4 Listen to the recorded music and save the audio.
If you think it is too long, you can even set the start and end time to cut the audio.
When it is done, click Save to name the audio file and browse for the saving path.
The music will be saved in the folder that you've chosen.
So now you save the music in YouTube with the audio recorder. In order to manage the music better, you may need to add the ID3 tag (i.e. the singer, year, name, style, and all the information of the song) to the music. In this case, you will need an MP3 tag editor.