[thunderous piano] [dramatic melody] (pagano) the development section is probably one of the reasons why composers really favor this form, because it gives them the chance to explore tonal possibilities. [ensemble continues] (ying) just when the development section seems to be getting crazier and crazier, harmonies start getting odder and odder, and you wonder what's gone wrong with this piece. it sounds so strange and not at home. well, just at that moment, you'll hear [plays melody line] the beginning of the piece again. but this time, instead of soft and ominous, it comes crashing in with the most, sort of the biggest amount of passion and really intense. (ying) there are many different kinds of form, but essentially they all take the same tact, that something has to happen over the course of time, and you have various things that will come back and repeat. and those repetitions are what signals your ear. they're the sign points for structure. so whether it's a sonata form, whether it's a binary or ternary form, these aural sign points are what indicate to you when the various sec

(pagano) harmony in western classical music has always kind of come with a set of rules.rs were supposed to follow those rules. of course, being creative people, they also wanted to explore further tonal possibilities. so each composer would try to take harmony to kind of the next step. by the end of the 19th century composers had moved harmony almost to a breaking point. they had basically explored as far as they could go, and then they decided to break with harmony and tonality. and that's when atonal music came in. it was so to the edge that you don't have a neat, clean, predictable harmonic progression. [light jazz music] (narrator) while much of western classical music in the 20th century has moved away from tonality popular music and traditional jazz have not. in jazz, it is the chord progression of the tune that provides the foundation for the improvisations of the soloist. [solo saxophone plays] (tesar) if i'm playing with a group, i have to coordinate certain elements of the harmonic accompaniment with other players particularly the bass player. he and i have got