Verse:
G D
You change your mind,
Am C
Like a girl changes clothes,
etc. (the same for all the verses)
Chorus:
G
Your hot then your cold
D
Your yes then your no,
Am
Your in then your out,
C
Your up then your down
etc. for whole chorus
[ Tab from: https://www.guitartabs.cc/tabs/k/katy_perry/hot_n_cold_crd_ver_3.html ]
Verse
Chorus
Bridge:
Em C
Will someone call the doctor
G D
I got another case of bipolar
etc......
[Pluck or strum slowly]
G D
You change your mind,
Am C
Like a girl changes clothes
Chorus a couple of times and then your'e good =]
Enjoy xx.
