《Since U Been Gone》是美國女歌手凱莉·克萊森演唱的一首流行搖滾歌曲，歌詞、曲譜由馬克斯·馬丁和Dr. Luke編寫創作，音樂製作由馬克斯·馬丁和Dr. Luke負責。該歌曲作為推廣專輯的首張單曲，於2004年11月16日通過美國廣播唱片公司發布，被收錄在凱莉·克萊森於2004年11月30日發行的第二張錄音室專輯《Breakaway》。
《Since U Been Gone》在美國、英國、澳大利亞、奧地利、德國、義大利、愛爾蘭、荷蘭、挪威、瑞士這十個國家的音樂排行榜上均排名前十，在美國公告牌百強單曲榜位居亞軍之位，並分別拿下公告牌百強流行音樂榜和公告牌主流40強單曲榜冠軍。
《Since U Been Gone》最初是馬克斯·馬丁和Dr. Luke為P!nk而寫，但是P!nk拒絕了這首歌。而後，希拉蕊·達夫的唱片公司高官對這首歌很感興趣，但因希拉蕊·達夫無法唱出這首歌曲中的高音而作罷。最後，凱莉·克萊森的唱片公司高管克萊夫·戴維斯在知道馬克斯·馬丁和Dr. Luke還沒有找到適合唱這首歌的歌手後，便向馬克斯·馬丁和Dr. Luke要這首歌。儘管他們兩人並不太願意，但還是將歌曲交給凱莉·克萊森演唱。
歌曲在錄製Maratone錄音室錄製，當凱莉在錄音室看到馬克斯·馬丁製作《Since U Been Gone》後，她就和這首歌的另一位作者Dr. Luke一起加入了制曲的工作。在聽完歌曲的樣本後，凱莉·克萊森的第一感覺就是這首歌聽起來太過流行，所以凱莉·克萊森就詢問其他兩人能否讓她把這首歌做的更搖滾一點。於是，凱莉·克萊森在歌曲中加入了一些比較重的定音鼓打擊節拍以及流暢的電吉他，結果讓這首歌變得更具爆炸性。
歌曲歌詞
英文歌詞
中文歌詞
Here's the thingWe started out friends It was cool, but it was all pretend Yeah, yeah Since you been gone You're dedicated, you took the time Wasn't long till I called you mine Yeah, yeah Since you been gone And all you'd ever hear me say Is how I picture me with you That's all you'd ever hear me say But since you been gone I can breathe for the first time I'm so moving on Yeah, yeah Thanks to you Now I get what I want Since you been gone How can I put it? You put me on I even fell for that stupid love song Yeah, yeah Since you been gone How come I've never heard you say I just want to be with you? Guess you never felt that way But since you been gone I can breathe for the first time I'm so moving on Yeah, yeah Thanks to you Now I get what I want Since you been gone You had your chance, you blew it Out of sight, out of mind Shut your mouth, I just can't take it Again, and again, and again, and again Since you been gone (since you been gone) I can breathe for the first time I'm so moving on Yeah, yeah Thanks to you (thanks to you) Now I get, I get what I want I can breathe for the first time I'm so moving on Yeah, yeah Thanks to you (thanks to you), now I get (I get) You should know (you should know) That I get I get what I want Since you been gone Since you been gone Since you been gone
《Since U Been Gone》歌曲音調為G大調，內部設有每分鐘132次的節拍，和弦遵循“Am–Em–F”，而作為錄唱歌手，凱莉·克萊森的音域介於G3到G5之間，該歌曲中的電子元素富有光澤，是女性流行歌曲的範本。《Since U Been Gone》是一首充斥著爆發力與戲劇性咆哮唱腔的搖滾歌曲，它的出現讓歌迷見識到凱莉·克萊森自主又銳不可當的一面。
