In the third movement of Sinfonia Berio lays the groundwork by quoting multiple excerpts from the third movement scherzo from Mahler's Symphony No. 2 and has the orchestra play a slightly cut-up, re-shuffled and occasionally re-orchestrated version of it. Many have described Berio's third movement as a "musical collage", in essence using an "Ivesian" approach to the entire movement (American composer Charles Ives in his Symphony No. 2 first used musical quotation techniques on a grand scale at the turn of the 20th century about 65 years earlier).
The orchestra plays snatches of Claude Debussy's La Mer, Maurice Ravel's La Valse, Igor Stravinsky's The Rite of Spring, as well as quotations from Arnold Schoenberg, Anton Webern, Johannes Brahms, Henri Pousseur, Paul Hindemith, and many others (including Berio himself) creating a dense collage, occasionally to humorous effect. When one of the reciters says "I have a present for you", the orchestra follows immediately with the introductory chord from Don, the first movement from Pli selon pli by Pierre Boulez.
The quoted fragments are often chosen because they bear a rhythmic or melodic likeness to Mahler's scherzo. For example, Berio uses a violin line from the second movement of Alban Berg's violin concerto with chromatically descending sixteenth notes two measures before a similarly descending line appears in Mahler's scherzo. This is then accompanied by another violin descent, taken from Johannes Brahms' violin concerto (Schwartz & Godfrey 1993, p.378). The text from Beckett at this point begins, "So after a period of immaculate silence there seemed", but, instead of continuing the quotation ("a feeble cry was heard by me"), Berio substitutes the words "to be a violin concerto being played in the other room in three quarters" and then, after the Berg quotation, alto 2 insists on "two violin concertos", at the point where Berg is interrupted by Brahms (Hicks & 1980–81, p.214).
The eight individual voices simultaneously recite texts from various sources, most notably the first page of Samuel Beckett's The Unnamable. Other text fragments include references to James Joyce, graffiti Berio noticed during the May 1968 protests in Paris and notes from Berio's diary (Schwartz & Godfrey 1993, p.376).
A partial list of musical quotations used in the third movement of Sinfonia in order of their appearance: