I just knew that when Paz tried to throw Lex Luger under the bus, people would post "Grooveline Pt. 1" up.
...but I don't think your taste in music always determines your intelligence for this reason: people listen to/make music for different reasons. Some people listen to music for the performance of certain artists on tracks rather than their lyrical content. I can listen to Nas, Talib Kweli, Mos Def for lyricism, but there are times where you want to listen to something less lyrical (Waka Flocka, 2 Chainz) for the production and the performance on the track.
That's the beauty of music. If you have diverse taste, it can be situational & depend on what kind of emotion you're trying to enhance at the time.
I'm from Detroit and have lived in the hood my entire life. My friends grew up in the same area and growing up, yet we were all into rock and hip-hop. I was more into lyrical underground rap until I got older became an athlete. It helped expand my tastes. I enjoy orchestra music so I put "One-Winged Angel" on my computer playlist but if I'm super amped up, I want something with more bass & energy like "BMF" or "Guerilla Radio" (which I like for the message and the instrumentation).
All of my friends can play instruments by ear and their tastes are just as diverse. From Kanye to Coheed & Cambria, Coldplay to Mozart to Drake.
Some people just like music because...it sounds nice. LOL. It makes you feel good. It pumps you up for the occasion.
One of the most intelligent girls I know from college (Meghan Tonjes) ended up on the Ellen DeGeneres show because she taught herself guitar and started playing covers of songs she liked on Youtube and editing her own videos. In college, the chick was a computer genius, but she still likes Britney Spears b/c it's fun to listen to.
Can't just put people in a box based on what moves them. Don't Plies & 2 Chainz have degrees anyway? What's the average intelligence of a Michael Jackson or Prince fan?