Malvina Reynolds - I've Got a Song lyrics

I've got a song, It's about so high, It's about this big around, It's got a wonderful sound, But I can't sing it. I've got a song, It's a shade of green, Embroidered all over with birds, But I don't know the words, So I can't sing it. Some day I'll get on a mountaintop And open up my mouth, And this great big song Will come rolling out And echo North and South. I've got a song, It's three miles long, It's bitter and strong and gay, And I'll sing it some day, And I'll sing it some day.