You can buy the rights to songs. I have a friend who makes photo videos for adoptive parents(pictures from their adoption journeys) and she looked into what she would have to do to use songs legally. There are ways, but it's not cheap(in some instances).
I have to say that I FULLY enjoyed your videos and they reduced me to tears every time I watched them. You have talent. I hope you can find a way to use it again.
Too many creepy lawyers, we need lyer reform!