  This note addresses the effects of long-ranged and/or retarded interactions
on the bosonic collective modes in the so-called 'strange metals'. Recently,
there have been conflicting reports on the very existence of such stable
collective excitations and their properties. Extending a number of approaches
that were previously used in the analyses of the standard Fermi liquid one
finds evidence for, both, conventional and novel behaviors of the
non-Fermi-liquid counterparts of the zero-, shear-, and other 'sounds'.
