Concert promoter Live Nation is offering up a week's worth of $20-dollar tickets for some of its biggest shows this summer. "National Concert Week" runs from April 30th through May 8th with more than 1.5-million tickets to more than 2,000 shows going for as little as $20-bucks. Click the link to check out the massive list of huge artists across all genres of music at drastic discounts to celebrate National Concert Week beginning Monday.

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