@LuckyCapitan: Look up the songs, and most likely a good portion of them are in public domain. Some of the then popular US music most likely is not, but the clock is ticking for that also... Using copyrighted material in a YouTube video, or similar, could get you a "strike" from them, or the video blocked at the least.
@flush deck: quoting "I'm not sure to have the last version of the Kaidai 3b, as you can see, I've no deck gun on my version and I intend to put one. If someone could help me on this task, that will be great. I'll try to get in touch with Keltos for this part." The gun should be in the original mod, but would be in one of the Library folders...