Comment by bigmealbigmeal

I'm personally a little frustrated with these music theory answers. Trust me folks, these answers are nearly impossible for a non-musician to understand (and even as a musician it's a bit impenetrable).

E minor gives you the exact same amount of options as C major. The options are just shuffled around a little bit. You literally get the same amount of notes in either, just a slightly different set. It isn't any more complex. Listeners aren't going to notice a difference, except one will probably sound happy and one will probably sound sad/angry. The "acceptance volume", to use the blog author's term, isn't any different.

At best, it can change things a little bit for some instruments. For example, with a vocalist, their voice can only go so high. They might be able to hit up to a high C, but not even higher up to an high E. If you're in C major, that's great, the vocalist's highest note (C) is the 'home note' which sounds great (playing a C in C Major makes the song sound like it's 'finished'). If you're E minor, the 'home note' is E, and as mentioned they wouldn't be able to hit that note. So you wouldn't really be able to 'finish' on a high note.

Ultimately, I doubt the author is a musician. It was a strange example to make their point.