There is a trick to copying a song out of a playlist so that you don't get the entire playlist. In the YouTube address bar link there is a code that says that this video is a part of a playlist and that code insures that the entire playlist plays back.
Here is a tutorial I devised:
If you are copying a link from YouTube and the video is a part of a list it will read like the following example:
www.youtube.com/watch?v=4wMOj2G0_CI&list=PL-FluPZ_76MP17hAj1h3CeYlRrT4AKZzh&index=11
The part you want to highlight and copy is all the way up until the ampersand before the word, "list".
For example:
www.youtube.com/watch?v=4wMOj2G0_CI&list=PL-FluPZ_76MP17hAj1h3CeYlRrT4AKZzh&index=11