I do not understand... are you having a problem, and what problem or error message?
Given that your have Premiere Elements 12 installed on Windows 8 64 bit.
(If you have not already, please update 12 to 12.1 using an opened project's Help Menu/Update.)
If you want to import a music file stored in Libraires/Documents/Music into a Premiere Elements 12 project, then you use the project's Expert workspace Add Media/Files and Folders/ and browse to and select your wanted file to bring it into Expert workspace/Project Assets/Timeline and one of its audio tracks. If you import files into the Quick workspace, you will find that there is no Project Assets. Rather the route is direct Add Media/Files and Folders (in this example)/scene spot in Filmstrip.
If you have iTunes music, you may have to convert the file to .wav file in iTunes before the music is imported into the Premiere Elements project. If needed, we can go step by step into how you use iTunes for this conversion.
Have you tried the prescribed Expert workspace Add Media route or are you seeking an alternative import route? Please try the prescribed Add Media route and let us know the results.
We will be watching for your details and results. Remember, the answers are in the details.
there is no error message what I am trying to do is copy and paste my own music to premiere
What IS your music?
Did you read what ATR wrote... especially about iTunes music?
The answers are in the details. So, let us fine tune them on both sides.
If you are not having music file compatibility issues related to iTunes in particular or other, then....
You cannot apply the Copy command to a music file in Documents/Music and then apply a Paste command in Premiere Elements to get the music included in your project. At least, I never have. And, I have used Premiere Elements for a long time, many versions. Apparently you cannot either.
Why not just use the project's Add Media/Files and Folders/Project Assets and from there drag the music to one of the Expert workspace Timeline's audio tracks? But....
If you do not want to do that, then the alternative to your "copy" music in Music Folder to "paste" in Premiere Elements is as follows
a. Cascade Music and Premiere Elements Windows
b. Just drag the music file in the opened Music Folder into one of the opened audio tracks of the opened Premiere Elements Expert workspace.
Please let me know if we are now in sync on the question and answer.
Thanks for the follow ups. Appreciated.