JoeGKushner said:5. Music Talent: Sorry, rapping requires some rhyming talent, but most of these rappers sing worse than either Simpson daughter. Take away rap and make them sing and it's over.
Musicians are often like authors or actors in that they work themselves solidly into one specific genre, but without ability to stretch beyond that genre. Every genre has it's conventions, and it is rather easy to learn only those conventions, and nothing else. Like many rock guitarists who learn a few blues chords they need to play rock, but founder if you ask them to play classical guitar.
The recording industry as a whole does not often reward versitility, or broad musical education.