How do I get my music off my iPod 4th generation 2004
Use iFunbox or try iExplorer to attempt to get all data off of the device. It will have encrypted file names, but the metadata will remain.

In other words, in iFunbox, find the iTunes_Control folder in the root file system, then right click music and click copy to my computer. 

In iExplorer, go into music, then press Control-A then Control-C (paste it in the desired directory after). If you are on Mac, go to music then press Command-A then Command-C. (Paste it in the desired directory after.)