Nice stuff. Although, it appears you've pasted in everything twice lol, you may want to fix that.
By the way, I did some researching for you and found that the MHGen Arena theme is called "Draped in Valor". And regarding the difference between MHGen and MHGU, the latter is basically considered an expansion to the base game. You could make the distinction to point out which songs came from the base game and which one game from Generations Ultimate, but I don't think anyone will really mind it, seeing as you bundled in the Monster Hunter World: Iceborne themes under Monster Hunter World anyway. You've also used some of the Japanese names for the monsters in some titles, but again I don't think it matters much.