I thought I would kick off another thread to discuss the subject, with a more appropriate title than the "Stonehenge bouncy castle". Though my initial thought is not so much about decadence.
I wonder whether one should not make a separation between music and other art forms? I don't know if anybody has read Daniel Levitin's book "Your brain on music", but he makes the interesting point that music actually involves every part of the brain in a way that no other activity does, including the part of the brain that controls movement. This suggests that music is perhaps goes much deeper than other art forms, which necessarily must be learned.
Could this mean that music is somehow less prone to "corruption" by decadence?
For those who are interested, here is a programme on Levitin's ideas including interviews and brain scans on various musicians. A bit sensationalist, but interesting nonetheless.