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Usually no more than seven.
To date Usher has released 48 singles through his life. His first single release was in 1993 and is entitles "Call Me A Mack" and was released on his album entitles "Poetic Justice".
East 17 is a pop band that has had 3 number 1 singles out of their 22 released singles. Their most recent album Dark Light was released in 2012 and has not has any number 1 singles.
Caroline Costa, a 16-year-old French singer, has released one album. The album is entitled "J'irai" and was released by EMI in March 2012. Caroline Costa has also released 4 singles.
I believed the count is now 15 singles she release and will be 16, soon, with the release of "Blown Away", the title track of her new album.
3 At the Moment...Beat Again, Everybody In Love, One Shot.
she released her first album this Monday and has made 2 singles "Price tag" and "Do it like a dude"
In the United States, the album had two number one hits, which were Billie Jean and Beat It........Though there were seven songs that were in the top ten all together from the album including Billie Jean and Beat It.
2 (Uncle B & Against All Odds ) but there has been some singles not found on the album and singles from when they were ''nw1'' and ''lickle rinsers crew'' =]
Currently, MBLAQ released 20 albums: one studio album, 1 repackaged album, 5 EPs, 2 repackaged EPs, 2 digital singles, 1 Japanese compilation, 3 Japanese singles, 4 DVDs.
She had 4 singles in 2009 and 1 new album, not including her collaborations with Beyoncé and Wayne, or her singles or album from 2008.
Slipknot has released 4 studio album, 1 live album, 12 singles, and 3 video albums. There newest cd, All Hope is Gone, came out in August 2008.