Rachmaninoff’s rapturous and romantic Symphony No. 2 unfurls a never-ending cascade of lush, opulent melodies, each one bound to speak directly to the heart. Plus, immerse yourself in Toru Takemitsu’s beautiful and mesmerizing homage to the ocean, Toward the Sea, featuring the Symphony’s Megan Conley, harp, and Matthew Roitstein, flute. Rising young French conductor Lionel …