Somebody said it!
It often is not crucial or even relevant to know who is the author of a remarkable statement.
For instance, it is often attributed to Winston Churchill the observation that the US and the UK are "divided by a common language. What is relevant is that the
statement contains more than a pinch of truth.
The idea that architecture is frozen music, and consequently that music is liquid architecture, has been attributed to many famous people. Among them Schelling, Schopenhauer, Goethe, and Liszt.