Thanks to everyone for the replies!
Not really happy with the fact that despite double checking the thread I didn't noticed that I scrolled past what I was looking for, so I really hope I didn't make any more mistakes, but anyway the collection now should be complete! The initial plan was to check every music mod to keep just the good ones, but there really are too many, and some are not even listed in the "M_" mods because they are part of other mods, so I will just put them all in one separate folder, and advise you to stick on the good old "Beep Block", or to generally avoid Ikku's music mods, the ones with "V1" or "V2" in their name (with all respect to his work, he made incredible character mods, just terrible music mods).
Now I need to check every double mod I got to see which one is the newest/best version of the two (I got some mods with the same name but different size, so I have to check each one of them singularly, due to the game inability to load two mods with the same file name at the same time).
Finally, I will have to check every Ikku mod I have and see if the number of poses corresponds to the number of poses that that character should have based on his site, to be sure they are the final version.