Why do professional recordings sound, well…professional? There are a number of reasons including high quality microphones, pre-amps, an experienced engineer and a well-designed studio space. But one of the single most important elements in a great-sounding, professional recording is the performance of the session musicians. There is a reason that the job of the session musician exists. It’s these musicians whose talent and studio experience contribute in a major way to the polished sound of a recording. Because there are different rules that apply when you’re recording an artist demo, I'm going to limit the scope of this article to songwriting demos specifically.