Erm, music tastes are not an indicator of intelligence. One of my high school classmates is mature, well-educated, well-raised, and a big fan of Justin Timberlake as well as of mainstream rap/hip-hop music. I listen to music for the melody, arrangement, and mood; be it classical, pop, or hip-hop, it has to be melodic and resonate with my mood. And some of Justin Bieber's music does that for me.
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Leading a double life and loving it (but exhausted).
Likely ADHD instead of what I've been diagnosed with before.