Chiptunes is music made using video game consoles as instruments. One great source for chiptunes albums is chiptunes netlabel http://8bitpeoples.com/. Most chiptunes songs are "instrumental", but a few use lyrics as well.
If you are interested in trying chiptunes, my favorite albums and the ones which are most like pop are (decreasing order of poppiness):
- Random - Happy Ending After All -- try "The Wrong Mistake" or "Beautiful Brutality"
- Anamanaguchi - Power Supply -- try "Helix Nebula"
- Bit Shifter - Information Chase -- try "Reformat the Planet"
- RushJet1 - Sounds of the 2A03 -- try "Bob's Theme"