The Prelude in B-Flat Major, Op. 23 No. 2 is a composition by Sergei Rachmaninoff completed and premiered in 1903. [1] [2]
This virtuoso piece is rhythmically complex, contrasting thunderous left-hand ostinato against a jagged right-hand melodic line. As in Chopin's Revolutionary Etude, the performer must possess considerable left-hand endurance to maintain a consistent legato throughout the piece.
The structural form of the piece is ternary, roughly "ABA" with a coda. The main "idea" of the composition appears in measure 3:
Here, the left-hand ostinato continues unimpeded as the treble line, accented and marked sempre marcato and fortissimo makes a regal entrance. By measure 20, the kernel of measure 3 is varied drastically, into a transcendent sequence that introduces an inner voice and offsets the main theme.
In measures 28–37, the Prelude transitions back to the main theme in a mini-encaptulation of classic first rondo form. The quasi-rondo section forecasts the return of the A section, which is in fact restated in measure 30, albeit disguised in a different key and form.
With the exception of measure 52, measures 38–54 are an exact repetition of the main theme. Measure 52 is pure Rachmaninoff: a vertigo-inducing cluster no doubt inspired by the composer's stupendous chord-playing technique.
Much of the prelude is of a traditional harmonic nature. The modulation from B-flat major to D minor that occurs between measures 6 and 7 (and reappears at measures 14–15, 20–21, 41–42, and 49–50) is strongly characteristic of Rachmaninoff's music. In measure 7, Rachmaninoff reinforces the main theme by moving up a third to the dominant chord. The overall impression of the upward movement is a sense of elevation and grandiosity.
Much of the piece's structure is quite solid. For instance, in measures 21–27, a series of transient modulations occur around the circle of fifths. Brilliantly, these modulations transition into a much less-structured series of embellishments (the right hand embellishes the left-hand harmonic pattern with minor-second sequences) starting at measure 28.
This kind of chromatic embellishment appears frequently in Rachmaninoff's later works, and is perhaps the composer's first use of this technique.
Texturally, the Prelude is homophonic. The main theme is perhaps a bit richer than the B section, where right- and left-hand accompaniments continue to outline chords around the second theme.
Slight variation, one of Rachmaninoff's hallmark compositional techniques, is employed throughout the prelude. For example, in measure 4, an intensification is created by very subtly changing the rhythm at the end of the phrase. Unusual rhythmic variation along the same lines is evident in measure 22:
David Oistrakh played an orchestral arrangement of this piece in a Soviet propaganda film of the 1950s. [3]
In music, an ostinato is a motif or phrase that persistently repeats in the same musical voice, frequently in the same pitch. Well-known ostinato-based pieces include classical compositions such as Ravel's Boléro and the Carol of the Bells, and popular songs such as Donna Summer and Giorgio Moroder's "I Feel Love" (1977), Henry Mancini's theme from Peter Gunn (1959), The Who's "Baba O'Riley" (1971), and The Verve's "Bitter Sweet Symphony" (1997).
In music, variation is a formal technique where material is repeated in an altered form. The changes may involve melody, rhythm, harmony, counterpoint, timbre, orchestration or any combination of these.
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