One of my favorite theme songs!! rumer has it that the singer is Ben Kweller so I'm 
tabbing the entire song under this artist, go check it out if u want.
Standard E tunning

E                         F#m
   I don?t know where I?d be
                   D   A          E
without someone to see this thing through
            F#m
I am such a mess
           D
even at my best
    A           E
I?m better with you

*tab by BadAssChick @ultimate-guitar.com