  We study theoretically the cooperative light emission from a system of $N\gg
1$ classical oscillators confined within a volume with spatial scale, $L$, much
smaller than the radiation wavelength, $\lambda_0=2\pi c/\omega_0$. We assume
that the oscillators frequencies are randomly distributed around a central
frequency, $\omega_0$, with some characteristic width, $\Omega\ll\omega_0$. In
the absence of disorder, that is $\Omega=0$, the cooperative emission spectrum
is composed of a narrow subradiant peak superimposed on a wide superradiant
band. When $\Omega\neq 0$, we demonstrate that if $N$ is large enough, the
subradiant peak is not simply broadened by the disorder but rather splits into
a system of random narrow peaks. We estimate the spectral width of these peaks
as a function of $N, L, \Omega$, and $\lambda_0$. We also estimate the
amplitude of this mesoscopic structure in the emission spectrum.
