"The most useful asset of a person is not a head full of knowledge but a heart full of love, with ears open to listen and hands willing to help."
This is what your favorite artists need. You don't have to know anymore than the fact that their talent is something you want to share with other people, that their music touched you and that by speaking up for them it may touch someone else. That's all it takes to make a difference - the heart willing to share, the hands willing to help and ears that will listen.
That's all the knowledge you need.