[Verse 1]
 
F7       Bb         F7           Bb           F7
When the little Bluebird who has never said a word
          Bb     Bb+     Bb6     Bb+ Bb F+ Bb6
Starts to sing: "Spring, spring"
F7       Bb         F7           Bb            F7
When the little Bluebell, in the bottom of the dell
          Bb     Bb+   Bb6   Bb+ Bb F+ Bb6
Starts to ring: "Ding, ding"
Bb+      Gm     Gm/F# Gm/F          C7            F7
When the little blue  clerk, in the middle of his work,
         Bb          Bdim    F7
Starts a tune to the moon up above
F+    Bb             Bb7         Eb                 Ebm Bb   F+ Bb6 F+ Bb6
It is nature, that's all, simply telling us to fall in  love
 
 
[Verse 2]
 
https://www.coveralia.com/acordes/let-s-do-it--let-s-fall-in-love--tony-bennett-y-lady-gaga.php
F+             Bb    Gm     Cm   F7
And that's why birds do it, bees do it
Bb     Bb7      Eb    Ebm   Bb      Gm    Cm      F7      Bb   Bdim
  Even educated fleas do it,  Let's do it.  Let's fall in love
Cm  F7         Bb   Gm    Cm   F7
 In Spain, the best upper sets do it, 
Bb     Bb7        Eb    Ebm   Bb      Gm    Cm      F7      Bb   Eb
  Lithuanians and Letts do it,  Let's do it.  Let's fall in love
Bb             Gm        Cm7       Bbmaj7               Bb7
  The Dutch in old Amsterdam do it,  not to mention the Finns
Eb         Ab7      Db                 F7
Folks in Siam do it,  think of Siamese twins
F+        Bb    Gm      Cm    F7
Some Argentines without means do it
Bb            Bb7         Eb    Ebm
People say in Boston even beans do it,  
Bb    Gm    Cm     F7      Bb   Ebm Bb
Let's do it. Let's fall in love