Each episode of "Now & Xen" features discussions of microtonal or xenharmonic music. If you ever wondered about possible musical notes and tunings beyond the ones we know, this podcast might interest you. Several episodes feature interviews with musicians and performers who use microtonal music and working in a variety of idioms, from pop and rock to classical music. A couple of early episodes also address the construction or adaptation of instruments for microtonal scales, software for music production, and the theory behind scale formation. Some discussions are dense for people like myself, with little to no formal music theory or training, but you will also hear clips from compositions or songs, and you don't need to have a background in music to open your ears and listen. You are certain to learn something about those hidden notes if you check out "Now&Xen."