I listen to orchestral, classical, and instrumental music when I am trying to concentrate or working on a project. Music with any sort of vocals is way too distracting for me. One of my favorite sources is a Youtube channel named Pandora Journey. They have videos that last from a few minutes to a couple of hours. Most include stunning digital artwork. I normally can put on a two-hour soundtrack and knock out a bunch of work, even complex stuff. It’s all licensed and copyrighted material compiled with permission from the artists.