What makes music soothing?

What is it in music that makes for good listening, and, at a higher plane, for soulful relaxing. Perhaps its "naad", a sanskrit word meaning "origin of sound", which generates this experience of sound, thus words, and thus songs - giving human existence an exalted position in universe. Perhaps its because music has rhythm, a flow, which helps human atoms synchronise itself with his/ her surroundings. Like a magnet helping electorns in iron bar straigtening themselves, giving them power hitherto unknown to them to attract metal henceforth. Music does it with our heart....... giving a sense of belonging to otherwise chaotic and unattached existence.

Just watched "Music and Lyrics " starring Barrymore and Grant. Genre was musical, but what I loved was the way words unfolded the story, in themselves evolving but helping the progression in an easy flowing manner. And, at the end was the question that i asked at the start of this piece - What is it in music that makes for good listening, and, at a higher plane, for soulful relaxing.