You seem to be new at using iTunes. I've never dragged and dropped to my music folder for my iPod. Maybe there's a video on how to add music? Yup. Here's one of thousands.
I have 2 iPods and when I plug them into my computer I get a nice little autoplay window that asks me (among other things) if I want to open the device to see its files. I do, and then can drag and drop songs from either of the iPods to my music folder.
My friend recently got a new iPod and gave me his old one. When I plug that one into my computer I get no autoplay window with choices. When I look under "Computer/removable devices" I do not see this iPod (whereas I always can see the others). So how can I copy songs to my computer?
If I run iTunes, it shows up there, but when I try to drag and drop to my music folder, I get that little red circle with a line through it indicating that function cannot be performed.