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Chord diagram for C
Chord diagram for Dm
Chord diagram for Am
Chord diagram for F
Chord diagram for Em
Chord diagram for G
      Note: I used ellaxo's tab for reference, but I just added and changed some chords.  All credits go to them!

Capo On Second

INTRO:
Strum once

C       Dm      Am      F


C                      Dm
  Within a minute I was all packed up
Am                     F
  I’ve got a ticket to another world
C                  Dm
  I don’t wanna go
                 Am     F
  I don’t wanna go
C                   Dm
  Suddenly words are hard to speak
Am                      F
  When your thoughts are all I see
C                 Dm              Am      F
 “Don’t ever leave,” she said to me


        C                 Dm
When we both fall asleep, underneath the same sky
Am                  F
To the beats of our hearts at the same time
C            Dm           Am
So close but so far away
         F
(Can you hear me?)


C               Dm          
  She sleeps alone
Am                  F
  My heart wants to come home
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you
C              Dm
  She lies awake
Am                       F
  I’m trying to find the words to say
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you


(Only C is in the song, the rest was added for filler)
INSTRUMENTAL:
Strum once

C       Dm      Am      F


C                      Dm
  Another day, and I’m somewhere new
Am                           F
  I made a promise that I’ll come home soon
C              Dm                    Am      F
 Bring me back, bring me back to you


        C            Dm
When we both wake up underneath the same sun
Am              F
  Time stops, I wish that I could rewind
C             Dm            Am      F
  So close but so far away


C               Dm          
  She sleeps alone
Am                  F
  My heart wants to come home
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you
C              Dm
  She lies awake
Am                       F
  I’m trying to find the words to say
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you


INSTRUMENTAL:
Strum twice

C     Dm     Am     F

C     Dm     Am     Em


Dm               C
  The pieces of us both
F         Dm
Under every city light 
Em           Am        F    Dm   F    G
And the shining as we fade into the night


Strum once:

C               Dm
 She sleeps alone
Am                    F
 My heart wants to come home
C            Dm           Am      F
 I wish I was, I wish I was


C               Dm          
  She sleeps alone
Am                  F
  My heart wants to come home
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you
C              Dm
  She lies awake
Am                       F
  I’m trying to find the words to say
C             Dm
  I wish I was, I wish I was
Am      F
  Beside you

C       Dm      Am            F
  She lies awake,  beside you
C                 Dm         Am      F
  I wish I was, I wish I was


C
 She sleeps alone
Am
 My heart wants to come home
C            Dm            Am      F
 I wish I was, I wish I was

(Added for filler)
ENDING:

C       Dm      Am      F

C       Dm      Am      F
    

Source: https://tabs.ultimate-guitar.com/tab/5_seconds_of_summer/beside_you_chords_1815638

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