I just noticed.. I think Inspire Heroics and Lingering Composition are incompatible with each other.
They're both a (free) action. And they both use the rule "If your next action is to cast xxxx". So a Bard needs to choose which one he combines with Inspire Courage.
No, there isn't. You always have to spend 1 focus per round of Inspire Heroics, you can't spend 2 to get 3-4 rounds of effect by combining these two free actions.