Now that the weather, at least in much of the country, has turned from polar to pollen vortex, it's time to start mapping out musical road trips. This year bodes well for exploring contemporary work. There are new-music meccas like California's Cabrillo, where all the music is current. At other festivals, like New York's Mostly Mozart, the classics mingle with the contemporary — this year spotlights 55-year-old British composer George Benjamin. And still others, like the Bard Festival, offer rare glimpses into forward-thinking composers from the mid-20th century.