A while back I thought they made all the bard abilities, minus their bow attack, usable while on the move. However, today I just noticed on my dirge that Howl of Death gets interrupted when you move. Just to double check I logged my troubador on and all of his abilities, minus his bow attack, are still usable while moving. Or am I just crazy and this spell was always this way?
Ok, figured it out... It was a brand new dirge alt and apparently only applies to the first tier of the spell. Logged on my higher level dirge and the spell doesn't get interrupted.