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'TRL' launched 25 years ago. Here are 10 memorable moments from the beloved MTV countdown show.

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Carson Daly hosted the first iteration of Total Request Live from 1999 until 2008 .

The show was part concert, part talk show and part countdown of the day 's top videos.

Viewers could expect to see stars such as Brandy, Usher, Eve , Jennifer Lopez and Jessica Simpson .

The Backstreet Boys' " Shape of My Heart " holds the record for the most days in the No. 1 spot.

Destiny's Child made their last appearance as a group on the show in 2005 .

Mariah Carey has an on-air "therapy session" on July 19, 2001 .