User blog comment:KressKross/Does Weiss actually sing?/@comment-10390252-20140806100146

My guess is that Weiss has a state-of-the-art karaoke machine that, amongst other functions, has a holographic front screen that gives you the illusion of singing or playing an instrument in front of an appreciative audience of the size the user requests. Weiss just wanted to be singing Mirror, Mirror before a stadium-sized audience.

I'd like for this machine to have a second appearence when RWBY visit Weiss's home one day. They end up playing Rock Band and, for some reason, the game provides them with an AI lead singer that is a Velciraptor wearing a pink feather boa.