inharmonic

Both harmonic and inharmonic overtones and a changing mix over time.

In reality any audible tone with a slow timbral change will have sub-sound, inharmonic undertones.

A marimba bar twists and stretches along many different axis, resulting in a complex inharmonic tone.

Even if its motion is non-linear, this will only cause anharmonic motion, not inharmonic, which is harmonic in the musical sense.

That's true by a limited definition of inharmonicity.

The bending component becomes especially important with thick strings, so a bass guitar produces noticeably inharmonic sounds.

Organs don't have inharmonic overtones, but organ tuning changes with air pressure/temperature/humidity, and organs are a big hassle to tune, so in practice organs rarely play at A=440Hz.

Stretch tuning would make sense for small niches of synthesized instruments that lie beyond the typical musician or sound designer's skills and tastes:- physical models that strive for realism enough to reproduce a defect - deliberately inharmonic additive synthesis - carefully designed FM/PM synthesisConversely, popular synthesis methods, particularly subtractive synthesis, are usually perfectly harmonic and do not need stretch tuning.