So much so that now, in direct protest against that idiotic notion, composers are bringing us back to the vibrancy of sound itself, getting us to really listen to sound without the intermediary of structure to distract us from paying attention.
One of the first composers to use the contrast between form and pure sound within his compositions was - hold your breath! - Muzio Clementi. Reveling in the new sounds of the piano he figured out ways to base structures on sounds you had never heard before. Brilliant in every respect.