I don’t have sheet music but here are the lyrics:
There's a voice now missing in our little country choir
Rock of Ages will never sound the same
God heard her singing and Heaven’s complete
Now Mama's teaching angels how to sing
Mama's teaching angels how to sing
Heaven's halls are silent when Mama sings
David lays down his harp and Heaven's bells won't ring
When Mama's teaching angels how to sing
The old home is now empty
Lord, it's lonesome since she's gone
And it's hard to know she won't return again
But I'll meet her in that morning on Heaven's golden hills
Where Mama's teaching angels how to sing
Mama's teaching angels how to sing
Heaven's halls are silent when Mama sings
David lays down his harp and Heaven's bells won't ring
When Mama's teaching angels how to sing
David lays down his harp and heaven's bells won't ring
When Mama's teaching angels how to sing
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Here’s the Isaacs’ rendition:
https://www.youtube.com/watch?v=uMESF4lNhBc