How to transfer music from my iPod to my new iPhone 6 Plus?

I just bought the new iPhone 6 Plus today. I'm trying to transfer my music from my 4th generation iPod to my new phone. I have about 450 songs on the iPod, only about 20-30 of which were actually purchased through iTunes. Basically, I got these songs from my old computer that is long gone and they are not in my iTunes library on my current computer. ITunes won't let me move the songs to the iPhone or even move them into the library. How can I transfer these songs to my iPhone? Any help is greatly appreciated.

Redownload everything from the iTunes. Logged in as your apple id that you used to download music to your iPod.