Haste Stacking.. Does Bard Haste stack with Chanter/shammy/item Haste

[Comapavik]

There is a "stackable" haste song in Velious called Melody of Ervaj. I don't think it can put you over the cap, but it stacks with spells + items + other songs I believe. I didn't use it much, think it was pretty much crap.