The song saw modest-to-low commercial success. 'I'm Your Daddy' was met with derision by many Weezer fans. I just wanted to say something to cheer her up or make or laugh, make her feel better. So I snuck off for a minute and started to write a song and the first line I wrote was 'You are my baby tonight and I'm your daddy'. And I've been there for 5 days and she wasn't getting better. Rivers: I was in the hospital with my 2-year-old daughter. When Weezer performed 'I'm Your Daddy' on Jimmy Kimmel live, lead singer Rivers Cuomo sang the first line as 'I thought tonight was a night like every other night,' rather than the original lyric, 'I thought tonight would suck like every other night.' This song was premiered live by Weezer at Jisan Valley Rock Festival in South Korea on July 24, 2009. 'I'm Your Daddy' was released as a single on Januand debuted at number 30 on Modern Rock Charts. From that line, Cuomo then had an idea to turn it into a song after his daughter showed a full recovery. Cuomo sat by her for five days and whispered to her that 'You're my baby tonight, and I'm your daddy'. According to Cuomo, his daughter was hospitalized because her white blood cell count was dropping and doctors were not sure if she would get better. In a Rolling Stone article, Weezer lead singer Rivers Cuomo explains that he got the idea for the song when his daughter, Mia Cuomo, was in the hospital.

I'm Your Daddy digital-45 single (iTunes Canada only).Happy Record Store Day! EP (AOL Sessions version) (2010)

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