 At the time of its release , Daydream became Carey 's best @-@ reviewed album . Critics universally praised her matured lyrics and songwriting , as well as her musical direction . The album became an international success , debuting at number one in nine different countries , and in the top five in almost every major music market . Daydream became Carey 's second album to be certified diamond by the Recording Industry Association of America ( RIAA ) , denoting shipments of ten million copies in the United States . Aside from its success in the United States , the album made the top five of the best @-@ selling albums in Japan by a non @-@ Asian artist , with 2 @.@ 1 million copies sold . Daydream remains one of the best @-@ selling albums of all time , with 25 million copies sold worldwide . 
 At the time of its release , Daydream became Carey <a href='null_genetive' title='1'><mark>'s</mark></a>best @-@ reviewed album . Critics universally praised her matured lyrics and songwriting , as well as her musical direction . The album became an international success , debuting at number one in nine different countries , and in the top five in almost every major music market . Daydream became Carey <a href='null_genetive' title='2'><mark>'s</mark></a>second album to be certified diamond by the Recording Industry Association of America ( RIAA ) , denoting shipments of ten million copies in the United States . Aside from its success in the United States , the album made the top five of the best @-@ selling albums in Japan by a non @-@ Asian artist , with 2 @.@ 1 million copies sold . Daydream <a href='uninflect' title='3'><mark>remains</mark></a> one of the best @-@ selling albums of all time , with 25 million copies sold worldwide . 
At da time of its release , Daydream became Carey  best @-@ reviewed album . Critics universally praised her matured lyrics and songwriting , as well as her musical direction . The album became an international success , debuting at number one in nine diffrent countries , and in the top five in almost every major music market . Daydream became Carey  second mixtape to be certified diamond by tdaRecording Industry Association of America ( RIAA ) , denoting shipments of ten million copies in the United States . Aside from its success in thdanited States , thedabum made the top five of the best @-@ sellin albums in Japan by a non @-@ Asian artist , with 2 @.@ 1 million copies sold . Daydream remain one of the best @-@ ssellinalbums of all time , with 25 million copies sold worldwide .