In the past complexity has been rewarded, also in music. Just think about notes of classical music. Ballads usually had an important verbal content.
But let us look at top downloads in youtube today. Let us try to analyse complexity. The most popular songs have rather simple music and often simple text. This has been not always true for rock. For example, groups like "Beatles" and "Queen" created rather complex content both in music and text, comparing to modern hits. "Uriah Heep" is a bit less known but its music often reminds classical symphonies and the text sometimes has some wisdom.