Although Bill Finger literally typed the scripts in the early days, he wrote the scripts from ideas that we mutually collaborated on. Many of the unique concepts and story twists also came from my own fertile imagination.
But if you want to be in a band and write music, then you should just be in a band and write music.
What everybody misses here is that we are doing the same thing my father did. He licensed and litigated and protected his property, and we have to follow the same tradition, because the way the law reads, if you don't protect it, you lose it.