Editing and adding music to DST

[SkyCommision]

Hello!

I'm trying to make a modification for Don't Starve which adds more music to the game and changes some tracks. I already know that it's at least possible, and i've found the .fsb music file. So, my main questions are these:

 

How does the vanilla game register and play music in certain situations, and is there a specific script somewhere for this?

Is there a good, free program out there that'll let me convert .fsb files (none of that 5-minute limit or something)?

Is there anything else I should know about Don't Starve's music?