"Jon Stewart corrals the biggest names in the business for a one-night-only, live comedy event filled with unexpected pairings, raucous surprises, and celebs galore. All proceeds from the purchase of Night of Too Many Stars will be donated to autism education and service programs." -- iTunes Store
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the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.