Here is the complete text of "I'll Overcome Some Day" from The Cyber Hymnal. They also have a midi file at this link.
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I'LL OVERCOME SOME DAY
(Charles A. Tindley, 1901)

This world is one great battlefield
With forces all arrayed,
If in my heart I do not yield
I'll overcome some day.
I'll overcome some day,
I'll overcome some day,
If in my heart I do not yield,
I'll overcome some day.

Both seen and unseen powers join
To drive my soul astray,
But with His Word a sword of mine,
I'll overcome some day.
I'll overcome some day,
I'll overcome some day,
But with His Word a sword of mine,
I'll overcome some day.

A thousand snares are set for me,
And mountains in my way,
If Jesus will my leader be,
I'll overcome some day.
I'll overcome some day,
I'll overcome some day,
If Jesus will my leader be,
I'll overcome some day.

I fail so often when I try
My Savior to obey;
It pains my heart and then I cry,
Lord, make me strong some day.
Lord, make me strong some day,
Lord, make me strong some day;
It pains my heart and then I cry,
Lord, make me strong some day.

My mind is not to do the wrong,
But walk the narrow way;
I'm praying as I journey on,
To overcome some day.
To overcome some day,
To overcome some day;
I'm praying as I journey on,
To overcome some day.

Though many a time no signs appear,
Of answer when I pray;
My Jesus says I need not fear,
He'll make it plain some day.
I'll be like Him some day,
I'll be like Him some day;
My Jesus says I need not fear,
He'll make it plain some day.