Much longer than anyone asked for, but:
What made me happy today is listening to twenty one pilots. No matter how I feel before, once I turn on their music, my mood is instantly lifted. Their songs make me happy because somebody else gets it. They understand, and turned it into art. The thought is beautiful, and always makes me happier than before. Plus, the songs sound happy, so even if I don't think about the lyrics, the music itself is "happy". For a few minutes, I can focus on the music, instead of what I was thinking about before.