Sirius sighed. "Yeah. It's not as easy as I thought from this end either. I think I understand a little better too ... the way you reacted, I mean. It's all ... What the fuck? Why now?"
He settled back against the wall. He wanted to put an arm around Harry, but wasn't sure he should. As soon as he recognized the thought, he did, laying his hand on his godson's far shoulder and drawing him close.
"You know that song that I used to sing now and then -- 'To a Dancer'? The song to someone who died, which I'd sometimes dedicate to them? I told Lily that I wanted to sing that, if she ever sang with me again, and that bothered her, but I told her the part that really matters is near the end." Sirius sang the words, his voice soft and uncertain without a guitar or a stage: 'Don't let the uncertainty turn you around -- go out and make a joyful sound.'
"I sang that song as often as I did because I was still working at that part of it. There was this thing that I understood, but I couldn't express on my own."
Sirius hesitated. He still wasn't sure he could explain it to someone else.