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Loudon Snowden Wainwright III (born September 5, 1946) is an American singer-songwriter and occasional actor. He has released twenty-six studio albums, four live albums, and six compilations. Some of his best-known songs include "The Swimming Song", "Motel Blues", "The Man Who Couldn't Cry", "Dead Skunk", and "Lullaby". In 2007, he collaborated with musician Joe Henry to create the soundtrack for Judd Apatow's film Knocked Up. In addition to music, he has acted in small roles in at least eighteen television programs and feature films, including three episodes in the third season of the series M*A*S*H.

Carol & the End of the World
as (voice)

Loudon Wainwright III: Surviving Twin

We Only Know So Much
as Theodore Copeland

Mosaic
as Casey Delacroix / Dennis Klein

No Pay, Nudity
as Brian Grant

I Had a Dream

The Late Show with Stephen Colbert
as Self

True Story
as Older Man
Pleased to Meet Me
as Eric

Sleepwalk with Me
as Uncle Max

Person of Interest
as Sheriff Landry

Certainty
as Tom

G-Force
as Grandpa Goodman

Parks and Recreation
as Barry

Knocked Up
as Dr. Howard

For Your Consideration
as Nominee Ben Connelly

Elizabethtown
as Uncle Dale

The 40 Year Old Virgin
as Priest

The Aviator
as Cocoanut Grove Vocalist #2

Big Fish
as Beamen

According to Jim
as Minister

Undeclared
as Hal Karp

Grounded for Life
as Dr. Weidlinger

28 Days
as Guitar Guy
The McGarrigle Hour
as self

Ally McBeal
as Jerome Trouper

Late Night with Conan O'Brien
as Self - Musical Guest

One Man Guy
as Self

Soldier Soldier
as Norman

Jacknife
as Ferretti

The Slugger's Wife
as Gary

Saturday Night Live
as Self - Musical Guest

Austin City Limits
as Self

M*A*S*H
as Capt. Calvin Spalding

The Old Grey Whistle Test
The Videographers
as Robin