Helping a novice streamer with stream setup

Hi all!

I'm not a streamer myself, but I have a friend who recently started to steam music (piano) on twitch. He's still trying to feel it out, but he asked me what I think about the stream. One thing I told him, and I'd like to possibly help him with is his setup. Specifically, his stream is way too dark, and although he's talented and all, I think it really hurts the stream.

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I'm considering buying him an EL wire or 5050 strip for the background so it'll be less dark and he could control it. What do you think?

Is there any good info, advice, guide etc on how a good setup should look? Advice about lighting? Any other advice you might have?

Thanks!