iTunes incorrectly coping files to library
I've been trying to add music from cds to my air. I have noticed that when I dragged the files from an external hard drive they are put into my library in strange places and are list as unkown artist and album. This also happens when I'm in iTunes and I try to add music from my external hard drive by using the drop down menu "add to library". Anyone know what is happening or if this a known issue with iTunes?
MacBook Air, OS X Mountain Lion (10.8.4)