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The 2000s gave us some of the most iconic No. 1 songs ever. Some, however, haven't stood the test of time. Head to our site to see all 19 songs you may have forgotten were No. 1 hits. (Credit: Peter Kramer/ASSOCIATED PRESS; Getty Images; Reuter’s Photographer/REUTERS; Powers Imagery/InvisionAP; Arif Qazi/Insider)