Music is only truly emotional when it's great.
That is the only part I disagree with. I can be emotionally transported very easily and profoundly by second, third or fourth rate works of art. Granted, it probably says a lot more about me than about music, but it is true nonetheless.
A gifted musician on an emotionally uneventful day can write/play the most heartwrenching and emotionally affecting music, while a less gifted musician could be going through emotionally turbulent times and create unremarkable music.Point is, it's the musical inspiration that creates a unique and appealing musical gesture, and that music in turn inspires an emotional reaction.
It's interesting to think about, sure, and emotion plays a part, I just feel that more often than not a composer will be inspired with a melody that strikes them emotionally and not in reverse.The reason I find this to be true is the near infinite variety of possible music ideas available to them, and the idea takes on a life of its own, it becomes an entity that affects its creator.
This is a logical fallacy. Just because emotions alone does not create great music does not imply that emotions don't create music at all. In your wording, the less gifted musician is still creating music; abeit one you find "unremarkable". Furthermore, your sentence is purely based on assumptions; you're assuming an event and creating its ending. I would argue that a gifted musician would have a deep emotional understanding of music; even on an emotionally uneventful day, whatever that is, will still be able to convey more emotions than the average person. I would also argue hat a gifted musician would play better music on an emotional day than an unemotional one. I will go as far as saying all truly great music was created based on emotions; and I will give an example rather than blindly creating a scenario; Chopin wrote his 3rd etude based on his love for his motherland; it has been said that he personally thinks that he will never find such a beautiful tune again. It was his emotional love for his country that he found this melody.