I'm a complete novice to composing and music theory, but part of what I'd like to do is acquire the vocabulary to describe subtle changes in sound, especially ones that evoke a distinct emotion. For instance, this is an orchestration of "Don't Cry For Me Argentina" : video here, and the main melody at 1:41 goes from a more proud and triumphant sound down into a much more mournful tone at around 1:51. The corresponding lyrics would be "All through my wild days, my mad existence..." The lowest notes especially just sink right into my gut (to wax poetic). What causes this sensation? What kind of harmonics are at work here? What would you call this bittersweet sound, like someone proudly standing to meet their end?
[I know this goes directly against the "please don't ask about X" rules, but I want to at least try, rather than giving up completely. If anyone knows of a more relevant website where I can get these kinds of questions answered without cluttering up this one, I'd appreciate any tips. Thank you for your time.]