iTunes folder content

Sorry if this sounds elementary, but here goes. I have had iTunes and a couple of iPod classics for years. I am trying to load songs on a Android smart phone. I am using the software that came with the phone and it works great. My question is what files or folders should be in the iTunes folder? I had another iTunes folder in my iTunes folder and during my search through my software to loan into the phone, I found songs/albums that was not in my iTunes library when I opened iTunes. So I deleted the smaller iTunes media folder. Still I can use windows explorer and find albums not showing up. Shouldn't all the albums in the media file appear on iTunes? Anyway just wondering how many and exactly what files/folders should be in there? I have a couple of "previous iTunes Library" like 6 of them. Can they be deleted? I hope I am not too confusing. My phone is a Motorola Razr Max and their software is Motocast. I do not want to go in and delete stuff without knowing what has to be there and what does not need to be there. Thanks, Kim:confused:

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