In musical terms, "sustain" is the duration of a sound before it becomes inaudible. Guitars have a lot of sustain, which is one reason for their rich, versatile sound. But the kinds of guitars that traditionally have the most sound-high-end, handmade instruments crafted from rare and exotic woods-are among the least sustainable, environmentally speaking. With help from organizations like Greenpeace, the music industry is doing something about it, before buying a new ax begins to seem a lot more literal.
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