YTMP3

Regarding Y2MP3...

And it's countless cousins/brothers/sisters.

I love Y2MP3. It's a really fast and useful way to get audio or music from youtube, for free, and with little to no hassle.

I personally have no issues with it. Minim seems to though. Files that are obtained by this means, if they work at all, oftentimes have inaccurate time stamps on them. To my own research, this is likely because of a few reasons. First and foremost, Youtube audio is not exported as mp3, but rather as m4a audio.  These sites then do the encoding and work to convert to mp3. I cannot testify to the exact process but therein seems to lie the problem. As the conversion happens, the timestamp seems to be lost in translation. In order to be able to include these files, you should convert them to a wave file or mp3 using a service like CloudConvert.