It's from "Kathleen Mavourneen."

— G

"Kathleen Mavourneen" (1837)
Words Mrs. Marion Crawford
Music by Frederick Nicholls Crouch, 1808-1896

1.
Kathleen mavourneen! the gray dawn is breaking,
The horn of the hunter is heard on the hill,
The lark from her light wing the bright dew is shaking,
Kathleen mavourneen, what slumbering still?

[CHORUS]
Oh! hast thou forgotten how soon we must sever?
Oh! hast thou forgotten this day we must part,
It may be for years, and it may be forever,
Oh! why art thou silent thou voice of my heart?
It may be for years, and it may be forever,
Then why art thou silent Kathleen mavourneen?

2.
Kathleen mavourneen, awake from thy slumbers,
The blue mountains glow in the sun's golden light,
Ah! where is the spell that once hung on thy numbers,
Arise in thy beauty, Thou star of my night,
Arise in thy beauty, Thou star of my night.

[CHORUS]
Mavourneen, mavourneen, my sad tears are falling,
To think that from Erin and thee I must part,
It may be for years, and it may be forever,
Then why art thou silent, thou voice of my heart?
It may be for years, and it may be forever,
Then why art thou silent, thou voice of my heart?Quoting David Davis
<[log in to unmask]>:

> As funny as it is, this one has to be derived from something. Any one
> know what?
>
> DDD
>
>                  Samuel Clemens! the gray dawn is breaking,
>                          The howl of the housemaid is heard in the hall;
>                  The cow from the back gate her exit is making,--
>                          What, Samuel Clemens? Slumbering still?
>