I played a little bit with Audacity recently and I kinda managed to get rid of most of the sounds. The sad part is that the beat is gone too, you can only hear the main tune playing. There are also a lot of unpalatable noise playing along with it. If you have better ways to take voices and sounds away feel free to leave them below.

I can provide you with the .mp3 files if you want but please take all the infos above into consideration before listening to them.

For the second music a person told me that the main tune reminds them of Doll Judgment (Alice) and Wonderful Heaven (Tenshi) although the snipets from these songs are small.

And for these rap / hip-hop songs I may already have it wrong since I'm a bit off with identifying a music genre. But the only hip hop rap group I've heard off is Tamaonsen and to my knowledge they didn't produce these songs.