Guild Wars 2

The BGM in-game seems one-sided to me. It needs variety.
Could there please be at least one piece per zone or at least even one unique for climate type (jungle, snowy mountains, beach, etc.)?
At best each zone would sound slightly different in addition to tracks that already play there.

you can add your own music to the game in differents situations (Battle , Ambient , etc…)

in where exactly?

http://wiki.guildwars2.com/wiki/Customized_soundtrack

This link explains it pretty well. I have my own soundtrack for GW2, which adds a total time of 9 hours :P