Spring for Music begins tonight with a performance by the Baltimore Symphony: Marin Alsop conducting John Adams, Jennifer Higdon, and Prokofiev. The following night, the Albany Symphony revives Morton Gould's Third Symphony, and after that comes the Buffalo Philharmonic, with more than fifteen hundred Buffalonians in tow. The most ambitious of the week's programs will be the Detroit Symphony's survey of the four numbered symphonies of Charles Ives. In the video above, Leonard Slatkin, Detroit's music director, unpacks the layers of Ives's phenomenal Fourth, which, as it happens, the New York Philharmonic just played the other week. As before, all tickets for Spring for Music events top out at $25.