This famed conductor's metamorphosis into a top composer continues with scary assurance. The steely opening of a four-movement violin concerto holds traces of his sterner school-chum influences, Magnus Lindberg and Kaija Saariaho. But by the time we get to "Pulse II," the rock-groove percussion driving us through a ride in a fast machine is indebted to John Adams' post-minimalism. This icy-hot mixture isn't derivative: It registers as pure Salonen. "Nyx," a 19-minute orchestral essay, is a nice bonus, but the violin concerto as fronted by soloist Leila Josefowicz can't be outdone.