Ballad songs and improvisatory instrumental pieces, like the fantasia, toccata or prelude are examples of additive compositions.
The sonata form emerges from an expanded rounded binary form in the Classical period. concerto-sonata form: derived from sonata form, but with two expositions (1. orchestra and soloist) and a solo cadenza between the recapitulation and the coda.
through-composed: continuous contrasting sections are composed together without repetitions of previous material.
round: an exact canon, ending at different times, as in ? imitation: two or more parts that have the same or similar phrase beginning and with delays between entrances (as in a round or canon), but after the beginning of the phrase, the parts diverge into separate melodies diatonic: a seven-note scale with a regular pattern of 5 whole and 2 half steps.
Diatonic intervals are found within this type of scale.chromatic: using pitches outside of a particular diatonic scale, or using a succession of half steps.major tonality: pitches are related to a central pitch called the tonic.
modified strophic: simply means that the repetitions of the sections are varied slightly, but not so much that they are a significant variation or the form: two sections of music, with only the first section A repeated.