Here is a selection of recordings by American poets of the 20th century (Walt Whitman being the exception; the collection kicks off with a wax-cylinder recording of Whitman reading in about 1890!) The poems are not arranged by date of composition or recording, but in order of the poet's birth. And it's not supposed to be any all inclusive best of sort of deal, and it doesn't reflect my 'taste'. It's just a few files I lifted.
William Carlos Williams (1883 –1963)
The Red Wheelbarrow
To Elsie
Ogden Nash (1902 –1971)
Portrait of the Artist as a Prematurely Old Man
Theodore Roethke (1908 –1963)
Elegy for Jane
Charles Bukowski (1920- 1994)
The Secret of My Endurance
Allen Ginsberg (1926 –1997)
America
Anne Sexton (1928-1974)
The Truth the Dead Know
All My Pretty Ones
Maya Angelou (b.1928)
Phenomenal Woman
Gary Snyder (b.1930)
The Song of the Taste
How Poetry Comes to Me
Why I Take Good Care of My Macintosh Computer