Here are some ways to extract audio from YouTube videos:

1. **Driver Easy**: Enter the YouTube video link that you want to extract the audio and click START button. Then the audio file (.mp3) will start downloading. Online convert is recommended if you just need to extract the audio one time.

2. **Animotica**: Launch Animotica and Select the Audio Extractor. Select the Video File and Save Your File.

3. **Keevi**: Use an online YouTube video extractor that does not require you to download software. Keevi is the perfect example. You just enter the URL of the video in the search tab. Then extract the audio and download it as an MP3 file.

4. **Inovideo**: Open VideoSolo Screen Recorder and enter the "Audio Recorder" mode. Set the system volume to the level you like, and turn off the microphone setting to avoid recording any noise. Play the YouTube video.