  Quantum acoustics -- a recently developed framework parallel to quantum
optics -- establishesa nonperturbative and coherent treatment of the
electron-phonon interaction in real space. The quantum-acoustical
representation reveals a displaced Drude peak hid ing in plain sight within the
venerable Fr\"ohlich model: the optical conductivity exhibits a finite
frequency maximum in the far-infrared range and the d.c. conductivity is
suppressed. Our results elucidate the origin of the high-temperature absorption
peaks in strange or bad metals, revealing that dynamical lattice disorder
steers the system towards a non-Drude behavior
