Paul Simon and Art Garfunkel became good friends after first meeting at elementary school in New York City, and grew into one of the most popular songwriting duos in the world. Though their friendship would be rocky over the intervening years, their partnership was artistically fruitful, yielding a clutch of classic albums and songs such as "Mrs. Robinson" and "Bridge Over Troubled Water".

In a world of digital downloads, the art of the album cover has been lost. But from the 1950s to the 1980s, album cover art was both a marketing tool and an expression of artistic intent.

The artist's proofs were typically destroyed once the album went to print. However, a few were salvaged and now considered to be collectors items. They are truly one-of-a-kind.