## Sketching sonata form structure

L. Bigo, M. Giraud, R. Groult, N. Guiomard-Kagan, F. LevĂ©, Sketching sonata form structure in selected classical string quartets ISMIR 2017

Many classical works from 18th and 19th centuries are *sonata forms*,
exhibiting a piece-level tonal path through an exposition, a development and a recapitulation
and involving two thematic zones as well as other elements.
The computational music analysis of scores with such a large-scale structure is a challenge
for the MIR community and should gather different analysis techniques.
We propose in our ISMIR 2017 paper first steps in that direction,
*combining analysis features on patterns, harmony, and other elements
into a structure estimated by a Viterbi algorithm on a Hidden Markov Model*.
We test this strategy on a set of first movements of Haydn and Mozart string quartets.
The proposed computational analysis strategy finds some pertinent features
and detects a sketch of the exposition/recapitulation structure in most of the pieces
that have a simple sonata form.

## Hidden Markov Model sketching a regular sonata form structure from analysis features

The initial state is P, the final states are S' and C'. The square states (MC ``medial caesura'', d ``transition to development'', p ``re-transition to primary theme'') are transient states intended to last one or a few quarters, and are characterized by break features (transition/emission probabilities

## Structure detection on ten first movements of Haydn and Mozart string quartets

The top lines are the reference analyses and the bottom line the structure found by the HMM. The four columns MC+S, D, P' and MC'+S' evaluate the prediction of the*start*of these events or sections: + (perfect or almost, that is at most 1 measure shifted from the reference), = (approximate match, between 2 and 3 measures), - (not found, or too far from the reference, at least 4 measures). We do not evaluate S positions (.) for pieces marked with ★, as they do not follow a "regular" bithematic sonata form structure with a clear secondary theme.

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