How do I find what itunes account and apple id I used years ago when I got my ipod?

Question

How do I merge my old ipod with my current itunes library.  I'm not sure of my previous itunes or apple id..

Answer 1

iPods (except for the iOS-based iPod touch) are not directly associated with an Apple ID.  The only way your Apple ID may comes into play is if you have songs on the iPod that were purchased from iTunes Store (using your Apple ID), and you want to transfer those purchased songs (not other songs) from the iPod into your current iTunes library.
If your goal is to transfer all song files from the iPod to your computer, you cannot do that (by design) using iTunes (except for songs that you purchased from the iTunes Store).  However, there are third-party methods and utilities that can transfer from iPod to computer.  If you do an Internet search on something like "iPod transfer," you should get some links.  (The CNET article seems to be popular.)
Once the song files are on your computer's drive, you can add them to your current iTunes library.  If you have songs purchased from the iTunes Store, and they are older purchases from the early days of the iTunes Store (when songs were copy protected), you may need to authorize your computer for the Apple ID used to make the purchases.  Otherwise, those songs will not play or sync.  Please post back if this is the case...