I do agree that the HF content of music signals does not reach the same SPL as that of the test signal.
Assuming you were still talking about square waves...
The square has a fundamental and a series of odd harmonics (the higher frequencies) at decreasing amplitude.
The amplitudes are 1/3, 1/5, 1/7, 1/9, 1/11 of the fundamental, and so on.
In Decibels, that would be approximately -9.5, -14, -16.9, -19.1, -20.8, and so on (again).
With a 100Hz square the frequencies would be 300, 500, 700, 900, 1100 (yes, and so on) in this partial sequence.
The 18,100Hz, the 181st frequency in the harmonic series, would be at 1/181 of the fundamental amplitude, or -45dB.
That level appears similar to what I often see in an RTA (in-room) of music with normal (cymbals/snares/whatever) HF content.
100Hz square, happens to hit about -45dB here (in-room) :
So, I could argue that music does reach the same SPL as a square test signal.
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