Multiple Sidosis
Encyclopedia
Multiple SIDosis is a 1970 short film in which a single performer creates an entire multi-part performance of the song "Nola". It is an example of a kind of one-man-band
One-man band
A one-man band is a musician who plays a number of musical instruments simultaneously using their hands, feet, limbs, and various mechanical contraptions. The simplest type of "one-man band" — a singer accompanying themselves on acoustic guitar and harmonica mounted in a metal "harp rack" below the...

 musical performance.

Multiple SIDosis was written by, directed by and starred Sid Laverents
Sid Laverents
Sidney Nicklas "Sid" Laverents was an American amateur filmmaker, who started making films at home when he was 50...

. It features as many as twelve split-screen "copies" of Laverents playing various conventional and improvised instruments simultaneously. The separately-recorded performances of the various parts were overdubbed
Overdubbing
Overdubbing is a technique used by recording studios to add a supplementary recorded sound to a previously recorded performance....

 and visually composited to create the final piece.

The overdubbing technique has been used before and since in professional recording studios, to allow a single performer to create an entire multi-instrument song. Digital technology has made the technique much easier for amateurs to employ today, but no such labour-saving devices were available to Laverents.

In 2000, Multiple SIDosis was selected for preservation in the United States National Film Registry
National Film Registry
The National Film Registry is the United States National Film Preservation Board's selection of films for preservation in the Library of Congress. The Board, established by the National Film Preservation Act of 1988, was reauthorized by acts of Congress in 1992, 1996, 2005, and again in October 2008...

 by the Library of Congress
Library of Congress
The Library of Congress is the research library of the United States Congress, de facto national library of the United States, and the oldest federal cultural institution in the United States. Located in three buildings in Washington, D.C., it is the largest library in the world by shelf space and...

as being "culturally, historically, or aesthetically significant".
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