Arcane Spell use
 

Does anyone know if there is a way to determine if a char has Bardic Music or at least 1 level of arcane spell use? I know for the bards there is something called, Hbardic but I cant find what it is exactly. Some feats require these things as prerequisites but I have no idea how to check for them. Any help would be great, thanks.

To find these, first make sure that "enable data file debugging" is checked at the top of the develop menu. Now, add a level of Bard, go to the develop menu, the last item is "Floating Info Windows" - choose "Show Selection List", and scroll through that list until you find that Bardic Music is hBrdMusic.

Here's how to write a pre-req that looks for that:
@valid = hero.pickexists[hBrdMusic]

For ability to use arcane spells, how about this pre-req from the Arcane Archer prestige class:
A character gets one Hero.Arcane tag for every level of spells they are able to cast, so this prereq, in the ">= 1 + 1" portion, is checking whether the character has the ability to cast 0-level spells + the ability to cast 1st-level spells.

Therefore, to check for the ability to cast arcane spells, you only need to check for:

@valid = tagis[Hero.Arcane]

What you're actually testing for there is the ability to cast cantrips.