Recently I've been thinking that no great idea is original a hundred percent. Behind every single really great innovator, designer, maker actually, there are a handful of others that inspired these people. Any great maker has heroes, and inspirations that they spend a huge time studying their every word, every work, every attempt.
It is as if they are our second family. Not in the usual sense, but rather on the "heritage" and "inheritance" part of it. We are the succession of our ancestry. That is the work of reproduction. We in a sense represent our parents, we some innovation. By each generation, we hopefully get a little bit better and therefore our whole kind gets pushed forward.
Hayden invents the Sonata form, then @mozart and @beethoven extensively study his work, continuously improve upon and each continue that in their own separate way. One thing that is written all of them is concertos. Now concerto was first heavily incarnated by Carl Philipp Emanuel Bach, who was the great influence upon Hayden. C.P.E. Bach is the son of @Bach. And he was greatly influenced by J.S. Bach. It is like a family tree but not shared by blood, but common interest.