I don't know how long youtubers have been doing it, but I just discovered it a while back. There are quite a number of songs that have been 3D'd. I mainly discovered it through Kpop, EXO of course, then LuHan and then some others. I enjoy it immensely but some find the sound too much for them. If you have a really good speaker system, then this will sound amazing. I love listening to them in my car, I have some foscate speakers that have some serious bass to it, so its pretty awesome. It is recommended that headphone/earbuds or what ever you use, is used to get a better experience.
Here are a few KPop songs and non-KPop songs for you to enjoy. ENJOY!
Non-Kpop music. Some of these have a long intro, a full minute long intro.
I thought there would be more non-kpop music in 3D but not really. But there a lot of KPop songs.