HAPPY BIRTHDAY TO YOU
Time signature: 3/4 
Typical tempo:  80 bpm.
Probably Patty Hill and Mildred J. Hill, 1893
See historic link at bottom of page.
Accordion Notation
Beats per bar = 3        
​Dots (or equivalent) per beat = 1                        
Either row (high):  Buttons 5 to 8
Inside row (low):  Buttons 2 to 5
Either row (high)

             "5   "5  |  .5*    .5    .6  |   :6*
           Hap-py   birth-day   to    you,
             "5   "5  |   .5*    .5     .7* |   :6
           Hap-py    birth-day    to     you,
             "5   "5  |   .8     .7     .6    |   .6* .5*~  
           Hap-py    birth-day  dear     [NAME],
             "8*   "8* |  .7     .6     .7*  |  :6~
            Hap-py    birth-day    to     you.
  Inside row (low)

             "2   "2  | .o3*   .2    .3  |   :2*
           Hap-py   birth-day   to    you,
             "2   "2  |  .o3*   .2     .3* |  :3
           Hap-py    birth-day    to     you,
             "2   "2  |   .5     .4     .3    |   .2* .o3*~  
           Hap-py    birth-day  dear      [NAME],
             "4*  "4* |   .4     .3     .3*  |  :3~
            Hap-py    birth-day    to     you.

Embedded youTUBE  VIDEOS
Key:   C    from time 0:06 to  0:52
          C#  from 0:53 to 1:18

Pianist:  ?

Posted by:  jeffip97music
Key:   D

​Pianist:  ?

Posted by:  The Suntrees Sky - Topic
Key:   D

Guitarist:  Markus Jimi Ivan

Posted by:  THECRAESH
Key: E

Tempo:  ~ 80 bpm.

Player(s) and Singers:  ? & ?

Posted by:  avistar11
Key:   F

Pianist:  Kaleb Brasee

​Posted by:  Kaleb Brasee

​
Key:  C
​
Tempo:  ~80 bpm

Players:  ? & ?

Posted by Yuri Charyguine 2013-09-24

Interesting Castelfidardo advertising. 
Built by Giancarlo Francenella.
Key:  G

Tempo ~65 bpm.

Player:  ?

Posted by:  Senor Parrandas

Cross-playing on a Hohner Corona II.
Key:  C

Tempo:  ~75 bpm.

Player:  ?

Posted by:  videowensblog

Playing an app on an android smart phone.
Key:  G

Tempo:  ~80 bpm.

Player:  ? Oscar Cedano ?

Posted by:  Oscar Cedano

Played using treble button chords. 
Key:   E

Group:  The Minions

​Posted by:  Hetari Plus

The amusing Minions youTube video at right has both a classical version and a rock-and-roll version of this birthday tune.
Background:
Click HERE for Wikipedia background information on Happy Birthday to You.  This will open in a new window, so you can easily move back and forth between the two sites.
Copyright Info:
​My note in July 2015:  Strange as it may sound, this birthday song may still have copyright protection (to be decided soon by a case in the United States.)

September 2015:  An American Federal Court decided that, for this song, the existing "copyright registration applied only to a specific piano arrangement of this song, and not to its lyrics and melody."