On the lake where drooped the willow, Long time ago,
Where the rock threw back the billow, Brighter than snow.
Dwelt a maid beloved and cherished, By high and low,
But with autumn leaf she perished, Long time ago.

Rock and tree and flowing water Long time ago,
Bird and bee and blossom taught her Love's spell to know.
While to my fond words she listened Murmuring low,
Tenderly her blue eyes glistened, Long time ago.

From a sheet music published by Boosey and Hawkes (1950)
It says "arranged by Aaron Copland".