The most reliable "all-in-one" method for Chrome users is to record the audio stream as it plays. Since these tools record rather than "rip" the file, they often bypass the restrictions faced by direct downloaders.
This is one of the most popular tools. You simply hit "Start Capture," play your YouTube video, and then "Stop and Save" to get an MP3 file. download audio from youtube in chrome
For advanced users, you can extract audio directly through Chrome’s built-in without installing anything extra: The most reliable "all-in-one" method for Chrome users