ground bass

formgrownd bayssfrom English

A short bass pattern repeated continuously throughout a composition while upper voices vary freely a‍‍‍‍‍‌‍‍‌‌‍‍‍‌‌‌‌‌‍‍‌‌‍‍‍‍‌‍‌‍‍‌bove it.

In Depth

Ground bass (also called basso ostinato) is a compositional technique where a bass line of typically‍‍‍‍‍‌‍‍‌‌‍‍‍‌‌‌‌‌‍‍‌‌‍‍‍‍‌‍‌‍‍‌ four to eight measures repeats in an unbroken cycle while the melody, harmony, and texture above it evolve freely. The technique creates a hypnotic effect — the recurring bass provides stability and inevitability while the upper voices generate variety and emotional development against this fixed foundation. The ground bass was a favorite device of Baroque composers, with Purcell's "When I am laid in earth" (Dido's Lament) from Dido and Aeneas being perhaps the most celebrated example. Its five-bar chromatic descending bass line, heard eleven times, becomes increasingly heartbreaking with each repetition. The chaconne and passacaglia are both formal types built on ground bass principles. The technique never disappeared — it underpins blues, jazz, and pop music in the form of repeating chord progressions and bass loops.

Did you know?

Purcell's ground bass in Dido's Lament uses a five-bar phrase rather than the standard four, creating a subtle asymmetry that makes each repetition feel slightly off-balance and more poignant.

Related Terms

ostinato chaconne passacaglia bass

More in Form

Browse all

AABA form

A 32-bar song form consisting of four 8-bar sections: two statements of the theme, a contrasting bridge, and a return

alap

The slow, meditative opening section of an Indian classical raga performance, exploring the raga without rhythm.

arch form

A palindromic musical structure that mirrors itself around a central axis, typically ABCBA

aria

A self-contained song for a solo voice, typically in an opera or oratorio.

ars antiqua

A period of medieval Western music from approximately 1170 to 1310, characterized by the development of early polyphony.

ars nova

A musical style of the late medieval period (c. 1310–1377), notable for its rhythmic innovation and increased complexity.

bagatelle

A short, light piano piece, often of modest technical demands

bass drop

A dramatic moment in electronic music where a deep, sub-bass frequency is suddenly introduced.

Keep Exploring

ostinato→chaconne→passacaglia→bass→