here's a list of the forms that i have (many people already have this in their textbooks, but it's kind of helpful if you are quickly looking to analyze a particular genre).
one part form (AA) is based on statement and repetition or statement and variation (A, A1)
many vocal songs carry this form and it is called 'strophic or modified strophic' if referring to vocal repertoire.
two part (binary) form is based on statement and contrast (AB or AA BB or A B A B). occasionally, in a binary form a portion of the opening A unit reappears at the end; this is termed 'rounded binary.' in early music these forms are used in varying patterns of statement and repetition in connection with the various poetic forms (formes fixes = virelais, rondeau, and ballade). the french overture form is a special type of binary structure whose first section is characterized by dotted rhythms in a relatively slow tempo while the second section begins with imitative counterpoint in a faster tempo; there is a possible return of the style of the opening section at the end of the second section. this structure is most characteristic of the baroque era.
three-part (ternary) form (ABA or A B A1)
minuet and trio form is a special type of ternary form used in dances, dance movements of symphonies, sonatas, and suites; in this particular type o f ABA form, the A section is referred to as 'the minuet' and the B section the 'trio.'
da capo form is yet another type of ternary form used only in vocal arias (from operas, oratorios, cantatas, passion, etc.) in this special application of the ternary principle, the A section is subdivided into five smaller units (opening orchestral ritornello, voice section, mid orchestral ritornello, voice, closing orchestral ritornello). after a contrasting mid section (B), the A section returns with the understanding that the singer will improvise embellishments to what is written by the composer. a variant of da capo form is the dal segno form in which the return of the A section is truncated by the omission of the opening ritornello.
rondo form is based on statement, contrast, and repetition (A B A C A or A B A C A D A pr A B A C A B A). the principal statement section (A) is called the refrain and the contrasting sections (B, C) are couplets or digressions. in a rondo, there are various possibilities for the number of sections and their relationship to one another. to be considered a rondo, usually there are at least three refrains and two couplets. a special type of rondo, the french rondo, has the pattern A B A C A D A E.
ritornello form is a form in which contrast is offerred not only through the presentation of new thematic material, but also new color and texture. ritornello form is used primarily in fast movements of baroque concertos. in this formal type, sections in which the full orchestra play (called tutti or ripieno sections) alternate with sections in which the soloist or the solo group play (solo sections). thus the contrast is one of instrumentation, color, size, texture, etc. units within a ritornello form are labeled as first tutti (T1), first solo (S1), second tutti (S2), etc.
variation form is based on statement and variation. this is a referential form. the composer starts with a theme and the subsequent form then results from his providing variations on that theme. the theme itself may be original with the composer or may be borrowed from teh works of another composer or a folk tune. each variation will retain some feature of the theme (normally the harmonic pattern or the phrase structure), but will provide variation in other elements.
the passacaglia and chaconne are special types of variation forms. in these formal types the theme itself repeats along with its variations. the term used to describe repetition of a theme is 'ostinato,' and sometimes passacaglia and chaconne are considered types of ostinato forms.
developmental forms (perhaps this is what prometheus was trying to say - sonata form not being necessarily an exact A B A form since the A section themes are thoroughly in the key when they return -- but in my own experience it is usually just labeled A - even though it would more adequately be called 'developmental form' instead of sonata form). so thanks, prometheus for suggesting an alternative label (which dr. murray has done with 'developmental form')
anyway, 'developmental forms' include:
sonata form
sonata allegro form
sonatina form
and concerto form
will add a few more forms later - copying this from dr. murray's writings.