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- Newsgroups: rec.music.compose
- Path: sparky!uunet!gatech!darwin.sura.net!spool.mu.edu!umn.edu!umeecs!zip.eecs.umich.edu!fields
- From: fields@zip.eecs.umich.edu (Matthew Fields)
- Subject: Re: // 5ths & 8ves
- Message-ID: <1992Dec29.182704.15444@zip.eecs.umich.edu>
- Sender: news@zip.eecs.umich.edu (Mr. News)
- Organization: University of Michigan EECS Dept., Ann Arbor
- References: <1h7qgbINNt2f@agate.berkeley.edu> <w2N9VB2w165w@dorsai.com> <1992Dec29.021154.25210@cucs5.cs.cuhk.hk>
- Date: Tue, 29 Dec 1992 18:27:04 GMT
- Lines: 41
-
- In article <1992Dec29.021154.25210@cucs5.cs.cuhk.hk> bmtong@cs.cuhk.hk (Tong Bo-Ming) writes:
- >My usual practice is this: if I have more than 4 parts, I allow myself
- >to have some octaves (and sometimes fifths as well). However, for n
- >parts I only allow n-4 parallel octaves. (What do you think about this
- >?) It is clear that the piece in my original posting does not obey this
- >rule, and my ear tells me that it is not too pleasing to hear. I
- >would seek some 'justification' from you.
-
-
- Whoops, this paragraph slipped right by me. 4 part chorale harmonization
- works pretty good for choirs, but sounds pretty thin on, e.g., a harpsichord,
- or too thick on 12-string guitar. If you're writing instrumental music,
- go look at a lot of instrumental music, and notice that the number of sounding
- voices can change constantly, and indeed be one of the more interesting
- variables of the composition.
-
- Chorale harmonization tunes move mainly stepwise. Look at, um, how
- about the prelude to the D major cello suite (no. 6) of J.S.Bach. The
- melodic line is dominated by by leaps, and fills our ear with the
- image of many melody lines that each move by step. Look at the trio
- of the minuet to the G major suite (no. 1). This composition in g
- minor has only one note sounding at a time, and is filled with leaps,
- but clearly expresses three melody lines, each of which moves mainly by step.
- This process of timesharing between melodies is called compound melody.
- I'm reminded of a research project somebody did at CCRMA at Stanford
- where they made a machine alternate between two different pitches, and
- found that both increasing the speed of altenation and widening the
- interval contributed to the sense of there being TWO sounds, whereas
- even a wide interval played slowly or a narrow one trilled fast sounds to
- most folks like a single sound source---a fact which composers had known
- and exploited for centuries, without giving or asking for a detailed
- quantification of the matter.
-
- Texture, by which word I mean the variable number of sounding parts, their
- distribution in register, the ways in which pairs of them may actually
- sound like a single melody (due to doubling at the unison or octave), and
- the ways in which individual lines may sound like multiple lines (through
- compound melody), is a concept you can play with to great expressive
- advantage. I encourage you to go look at and listen to your favorite
- classical works while concentrating on how they address texture...and to
- play around with it yourself.
-