  Randomly coupled phase oscillators may synchronize into disordered patterns
of collective motion. We analyze this transition in a large, fully connected
Kuramoto model with symmetric but otherwise independent random interactions.
Using the dynamical cavity method we reduce the dynamics to a stochastic
single-oscillator problem with self-consistent correlation and response
functions that we study analytically and numerically. We clarify the nature of
the volcano transition and elucidate its relation to the existence of an
oscillator glass phase.
