G#7 (464544) 
A#  (688766) 
C#  (446664) 
G#  (466544) 

The Am in the third and fourth verses is (577555).

[Intro]
F C G#7 G

[Verse 1]
C               G
Strains of humoresque divine
    F                    Am
You thrill and fill this heart of mine
     C                F              G
With gladness like a soothing symphony

[Verse 2]
C                 G
Over the air, you gently float
F                 Am
Into my soul, you strike a note
C                    F  G   C
Of passion with your melody

[Verse 3]
Am           G
Sunbeams are playing
F                     C
Flowers and trees are swaying
Am       F           G     C
Captured within your magic spell

[Verse 4]
Am                  G
If the children are dancing
F              C
Lovers are all romancing
Am        F           C       G
Is it any wonder, everyone is singing?

[Verse 5]
C               G
Strains of humoresque divine
    F                    Am
You thrill and fill this heart of mine
     C                F              G
With gladness like a soothing symphony

[Verse 6]
C                 G
Over the air, you gently float
F                 Am
Into my soul, you strike a note
C                    F  G   A#
Of passion with your melody

[Outro]
C# F G#
A# C# F G#