Question: how to download music from a youtube video?
Answer: Copy the video's address. ... 
Open 4K Video Downloader. ... 
Click Paste Link. ... 
Wait for the video to finish parsing. ... 
Click the "Download Video" drop-down and select Extract Audio. ... 
Change the audio file type (optional). ... 
Select a quality (optional). ... 
Click Browse to choose a save location.