I thought it was an interesting take on how micspam might have evolved in-universe for our favorite death-tag playing sociopaths. However, I kind of wish you went with some non-cliche musical taste choices, but that's mostly personal opinion. I also wish you did less name-dropping and more describing. While it can be reasonably expected that an average reader would know who you're talking about, just rattling off which artists and genres each class likes comes off as rather impersonal. By delving into more details, you can give us a deeper glimpse into the characters as well.