Overview

A glissando (plural: glissandi) is a musical effect in which pitches slide continuously or move rapidly stepwise from one note to another. The term derives from the French glisser, "to slide," and is commonly abbreviated as "gliss." In practice a glissando can be a smooth, unbroken shift of pitch or an audible sequence of adjacent tones depending on the instrument and technique.

Types and characteristics

Broadly speaking, performers and writers distinguish two types: a continuous glissando, which produces an uninterrupted change in pitch (microtonal on many instruments), and a discrete or chromatic/diatonic glissando, which sounds as a rapid succession of distinct notes. Continuous glissandi are typical on voice, slide trombone and string instruments; discrete glissandi occur on keyboard, harp and tuned percussion where intermediate pitches cannot be sounded continuously.

  • Continuous: produced by sliding the finger along a string or altering embouchure/slide position to change pitch; see examples on the violin, trombone and singing.
  • Discrete: heard as a rapid run of adjacent notes on instruments like the piano or xylophone or as pedal-modified rolls on the harp.

How different instruments produce glissandi

String players achieve glissando by maintaining bow pressure while sliding a finger along the fingerboard. Brass and wind players may adjust lip tension and fingering to slide; some clarinetists create a characteristic jazz glissando by altering embouchure and gradually lifting fingers off the keys, a technique famously heard at the opening of Gershwin's Rhapsody in Blue performed by the clarinet. Trombonists use the slide mechanism directly. On keyboard instruments like the piano, players perform glissandi by sweeping the side or nail across white or black keys, as heard in passages of Ravel's Gaspard de la nuit. Harpists exploit pedal changes to change the scale of a glissando. Some modern timpani have foot pedals to vary tension and permit a percussive timpani glissando.

Notation and terminology

Composers ordinarily indicate a glissando by writing the starting and ending notes and connecting them with a straight or wavy line, often accompanied by the abbreviation gliss. or the full word glissando. The written direction may specify white-key or black-key on piano, or whether the effect should be smooth or stepped. In vocal and orchestral practice, the related term portamento refers to a subtler, expressive slide between neighboring notes, whereas glissando tends to imply a more obvious, sometimes extended slide.

History, repertoire and notable uses

Glissandi appear across many musical styles and eras. Romantic and early 20th-century composers exploited them for color and drama: Maurice Ravel utilized pianistic glissandi in Ondine, Béla Bartók used timpani and orchestral slides for effect, and George Gershwin opened Rhapsody in Blue with a clarinet glissando. Jazz, blues and popular music adapted sliding gestures into bends and slides on instruments such as saxophone, clarinet and guitar.

Technique, practice and contemporary uses

Performers must adapt technique to instrument constraints: pianists protect fingertips when practising repeated glissandi; harpists plan pedal settings; wind players refine embouchure and finger movement; percussionists synchronize pedal changes. Electronic instruments and synthesizers accomplish glissando via pitch-bend controls, portamento settings or programmed gliss patterns, extending the effect into modern production and sound design.

Distinctions and notable facts

  1. The plural is glissandi, though many writers also use glissandos.
  2. Notation varies: wavy lines often suggest a free slide, straight lines imply a directed sweep.
  3. Some composers and performers treat glissando and portamento interchangeably; others maintain a strict expressive versus dramatic distinction.
  4. Historic and contemporary examples include works by Ravel, Bartók and Gershwin; see related sources on the composer Bartók, Gershwin and broader discussion of scale systems like the scale.

For further reading on specific instruments and technique consult practical manuals and performance guides, and listen to recorded examples to hear how glissandi differ between continuous and stepped realizations (notation examples, pitch, and instrument-specific demonstrations such as on the string family or in jazz contexts).