SOPP564: Important to me is to take songs which are outside of the Church or Classic repertoire

This question was sent by Jason. And he writes: Hello Vidas, Thank you for your email. My dreams are to be truly expressive in whatever I play. I want to do my own arrangements and improvisations to pieces. Important to me is to take songs which are outside of the Church or Classic repertoire. With these songs I would create interesting organ pieces with real musical depth, I’m talking about arranging music like Jimi Hendrix—Voodoo Child, David Bowie—life on Mars there are so many. Sticking with more standard pieces then new stuff like Hans Zimmer—Interstellar pieces would be great. But above all the knowledge and ability to arrange and play modern pieces. What is holding me back is my brain over complicating music theory. Thank you Jason