What is the difference in the bard songs that start Aura of __ (i.e. Composer) and those that start Echo of __ ? They seem to have the exact same effect. They both add a buff to the aura window that nearby allies get.
Aura of ___ follows your character. Echo of ___ creates a stationary aura where you initially "cast" the spell. Basic benefit to Echo ones being if you are playing the puller role for a group sitting in one spot so you can leave the aura effects active on your party while you are not in camp.
If you're using the mana/healing aura and are the puller with everyone else staying in one spot, you can use the echo and it will stay there when you run off. If you're using the haste/spell aura, it can stay with you 'cause you'd be using it in melee with everyone within your range. You can have only one aura/echo active at one time. You can switch between them but only one can be active.