I'm going to say that this is the new thing I've learned today. I had never heard of a license that said that you couldn't cut material from a play. I think that every play I've seen has had at least something cut or modified in some way. I've also been in a bunch of productions where we've made either huge changes or cobbled together something from several different sources. Mind you, I've only administrated copyright through CCLI. What difference would it make if you cut or changed something? If you've bought the music and/or you have purchased the right to put on a particular show, everyone's properly paid. I supposed you could argue that you're corrupting the author's work, but I've seen performances that would have corrupted it even if the song was performed in full.