I wouldn't think testing vocabulary would be a very good indicator of music's intelligence. In my mind, music has been getting less intelligent because the tools to make music these days have made the barrier to entry almost non-existent. No longer do you need to study and practice various musical/performance skills for years to be a musician and put out a record. All you need is a computer and some software. It's ha…
People looking to invest the minimal amount of time required studying in order to perform is not a new phenomenon. The pop charts of previous decades were filled with pretty terrible guitar playing for example.
Sure there were some great exceptions along with a bunch of dedicated session musicians to add that professional slickness, but that's no different from today's for-hire producers.