I'm not entirely sure, but I wasn't the only one experiencing the problem. After reading through some forums, other players were complaining that the songs wouldn't load. I'm assuming the Abbey Road songs are corrupted. I'll probably find another .wad file, but for now Sgt. Pepper, Rubber Soul and All You Need Is Love work just fine! Like I said, I'll try to get these songs on my Wii and will report back instructions on how to do it. If I can't get them on my Wii, the only option is using Dolphin 5.0 or higher.