> If you just let me be and let me listen to some music without being disturbed, I'll be perfectly calm and relaxed, no mysticism needed.

Do you spontaneously laugh because you're filled with such joy in this state of "relaxation"? I've done that after a body scan and just mindful breathing.

The thing with relaxation is it's easy to think you are relaxed until you experience actual deep relaxation. Search on youtube for "Yoga nidra", lie down and just follow the instructions. Simple yet profound.