From what I've read, it seems that an abstract noun cannot be detected by any of the five senses. So if it's detectable by just one sense, it's not abstract. Since music can be heard, air can be felt, and light can be seen, I would say none of them are abstract nouns.I understand that abstract nouns need not be detected by all five senses. That said, since music (only heard) is abstract, would light & air - since they do not appear to have many concrete qualities - also be abstract?
Also, is there an official website with substantial or comprehensive word lists to address questions like mine? I have found several sites with definitions and a few examples, but no good lists as of yet. Please advise - thanks!