Connie has her iTunes music on an external hard drive and once she's copied it over to the computer, she unplugs it and the music disappears. Leo says that's a preference issue in iTunes. She'll want to look where her iTunes Media folder is in the preference settings. iTunes may be looking for it in the external location.
Connie can reset it or check "Keep iTunes Media Folder Organized," and check the box that says "Copy Files to iTunes Media Folder" when adding a library. Those two need to be enabled. Then she can import her music. It will then rebuild her iTunes library on her PC, not the external drive.