Tube2mp3 is a Java application that lets you download audio from YouTube videos and converts it to MP3 format.
Although it looks a bit old fashioned, Tube2mp3 is very easy to use. Just use the Search field to find the video from which you want to extract the audio. You can search by title, artist, the name of the song, and more.
After showing the results, Tube2mp3 displays an annoying CAPTCHA, which you must fill in, and then you must wait while the audio downloads. Bear in mind that this can take a long time depending on your connection, and the download can eat into your data plan limit, so be cautious when downloading.
Once the file has been downloaded, Tube2mp3 converts to MP3 very quickly, then you're ready to enjoy listening to the audio on your phone.
With Tube2mp3 you can easily fill your phone's memory card with MP3 audio of your favorite YouTube videos.