You play the C7+5 chord like so:
A|---1------|
E|---0------|
C|---0------|
G|---1------|
C7
Oh,
F
You're a grand old flag you're a high-flying flag
C7
and forever in peace may you wave
C7 Gm7 C7 F C7 F
You're the emblem of the land I love
G7 C7
The home of the free and the brave
F
Ev'ry heart beats true for the red white and blue
D7 Gm
Where there's never a boast or brag
C7 F C7
Should auld acquaintance be forgot
G7 C7 F D7
keep your eye on that grand old flag
G7 C7 F
keep your eye on that grand old flag
C F G7
Oh I'm a yankee doodle dandy
C7 F
A yankee doodle do or die
D7 Gm
A real-life nephew of my Uncle Sam
G7 C7 C7+5
Born on the fourth of July
F G7
I've got a yankee doodle sweetheart
C7 F
She's my yankee doodle joy
F D7
Yankee Doodle went to London just to ride the ponies
G7 C7 F D7
I am that yankee doodle boy oh
G7 C7 F
I am that yankee doodle boy