If you mean by convering mp3 files from YouTube. By that I mean, pasting the link into a file converting site and then you have the song in it's 3:00 (whatever) length to listen to as mp3.
http://www.zamzar.co.uk is the best site for that, I use that. It takes about 30-45 minutes for the link to be sent to your email (sometimes 5 minutes depending what time of the day you do it, like now it would take longer), then go to your inbox and click the link and just download and save it. It's the actual length of the YouTube video that you put in, so no added 20 minutes or whatever.