Mariah Carey 2008年最新专辑《E=MC²》，也是她的第11张录音室大碟。
E=MC² 是爱因斯坦的著名理论，也就是质量和能量之间转化的公式，当然Mariah Carey采用这个作为专辑名称也是有寓意的。“E”代表Emancipation(呼应上一张专辑《The Emancipation of Mimi》)，即释放、解放；“MC”就是Mariah Carey的首字母缩写，E=MC²于是就有了另一个含义。
其中《Touch My Body》也成为Mariah Carey的第18支冠军单曲，这一成绩超过了“猫王”埃尔维斯·普莱斯利（Elvis Presley），她因此成为仅次于披头士乐队的艺人。闻听喜讯后的Mariah Carey在接受美联社采访时表示：“我从不认为自己是那种既革命了音乐又改变了世界的人。这是一个完全不同的时代纪元……我只是很开心，很感激。”披头士仍以20首冠军单曲领先所有歌手。
《Touch My Body》不但登上公告牌的冠军，还在发行的第一周就以28.6万的下载量稳坐数字下载榜的头名。Mariah Carey说她很感激自己能跻身猫王、披头士等伟大歌手之列，因为这不只是她个人的成功，而且对女歌手和少数派而言都意义重大。她说：“我所在流派在音乐界总有种局外人的感觉，谢谢上苍，在我遭到否定的时候给了我自信的信念。”

"Bye Bye" is a song written by American singer Mariah Carey, Johnta Austin and Mikkel S. Eriksen, and Tor Erik Hermansen for Carey's eleventh studio album, E=MC². It was produced by Carey and Stargate, and was released as the second single from the album.
MTV stated that although the song appears to be about her deceased father, Carey "extends this song about death to be for anybody 'who just lost somebody' they truly care about and those who lost someone they hate, you still end up either feeling gulity or missing them". Carey believed that by making "Bye Bye" more open, "everybody could kind of be healed by the song and have their own experience listening to it".
The song premiered on radio April 7, 2008 and has been played on various radio stations in the United States, according to Mediabase. The single became available to download at iTunes on April 14, 2008.
Carey first performed "Bye Bye" on T4 4Music and performed it again live on April 14, 2008, the single's digital release date, on The Oprah Winfrey Show and then again, two days later, on the result show of American Idol season 7 on April 16. Carey performed the song on Good Morning America on April 25, 2008.
The single officially went for adds on April 22, 2008 on Mainstream and Rhythm/Crossover stations.
There are currently two official remixes for "Bye Bye", the first features Jay Z, while the second is assisted by Akon and Lil Wayne.
The song was nominated for R&B Track award at the 2008 Teen Choice Awards.
In some european countries (like The Netherlands, Belgium, France and Swiss) the song was never released, instead "I'll Be Lovin' U Long Time", was sent to radio stations in July 2008 as the official 2nd single from the album.