kijanki
It is likely that harmonics of 22kHz come from percussion instruments, that are not continuous by nature.Any percussion instrument is an "continuous" as any violin or other instrument. Consistent with the Fourier Transform, this wave can be recorded.
... 100Hz (drum roll) will give you (modulated) 22kHz with bunch of sidebands spaced 100Hz apart ... Sidebands appear because signal is modulated (not continuous).The signal is analog, it is continuous.
The danger here is that anything above half of sampling frequency will, in D/A process, fold into 0Hz and up ...Anything exceeding half the sampling rate is filtered out as part of the A-D conversion process. It doesn't "fold" into anything. You can easily prove this with measurements.