"I'm With You" Is A Song By Canadian Singer-Songwriter Avril Lavigne From Her Debut Studio Album Let Go 2002 . It Was Released To Radio As The Third Single From The Album On November 18 2002 By Arista Records. The Song Was Written By Lavigne And The Production Team The Matrix Who Solely Helmed Its Production. According To Lavigne The Song Was Inspired By Feelings Of Loneliness She Experienced Over Being Single. "I'm With You" Is A Rock Song. According To The Sheet Music Published At Musicnotes.Com By Alfred Publishing The Song Is Written In The Key Of A Major And Is Set In A 6/8 Time Signature With A Tempo Of 56 Beats Per Minute. Lavigne's Vocal Range Spans Two Octaves From A3 To E5.