 " What You Waiting For ? " is a song by American singer and songwriter Gwen Stefani from her debut solo studio album , Love . Angel . Music . Baby . ( 2004 ) . Written by Stefani and Linda Perry , the song is the album 's opening track and was released as Stefani 's debut solo single . " What You Waiting For ? " was a commercial success worldwide , peaking at number two on the US Billboard Hot 100 and the Canadian Hot 100 .
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