儿女一箩筐背景音乐都是simple plan的吗？

不是，只有一首I'm Just a Kid是

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该电影里面的歌曲列表

"These are Days"
Written by Natalie Merchant and Robert Buck
Performed by 10,000 Maniacs
Courtesy of Elektra Entertainment Group
By Arrangement with Warner Strategic Marketing

"Ninety-Nine Bottles of Beer on the Wall"
Traditional

"People Come Together"
Music: M. Constanzo
Lyrics: M. Costanzo / P. Rae / M. Safiyullah / M. Wilson / S. Costanzo / J. Post / M. Taylor / K. Fareed / A. Muhammed / R. Foster
Performed by Len
Courtesy of Universal Music Canada/DreamWorks Records
Under license from Universal Music Enterprises
(Contains a sample of "Reach Out of the Darkness"
Written by J. Post
Performed by Friend and Lover
Courtesy of The Island Def Jam Music Group
Under license from Universal Music Enterprises
Also contains a sample of "Electric Relax