QUOTE(cellophan @ Jul 4 2007, 10:05 PM)
QUOTE(BusyBee @ Jul 4 2007, 08:44 PM)
I have been looking at exposed octaves this week. (I'm working on Grade 8 theory on my own and I'm revising from Grade 6). They are a bit different to consecutive octaves. The orange book by A. Butterworth explains it on p35. Perhaps you have already seen this page?
The rule is (as I see it) is that if all the notes (edit: not from a previous octave or fifth like in consecutive movement) move in similar motion towards an octave or fifth in the outer parts with a leap in the soprano top part then it is an exposed interval.
It's okay if the leap is in the bass with a step in the top part. I expect it's also okay if at least one of the parts go in contrary motion to the rest.
What always confuses me is - I think I've got it worked out and then I find a model answer somewhere that breaks the rule - really annoying!! That's when I think I need a teacher to tell me why!
Thank you BusyBee,
That makes it clearer but its the step part I'm still a little confused about; what is a step? Is it just moving up or down one note and does it only apply to the soprano part or can you cancel out the "exposed" bit by using a step in the bass instead of the soprano? I haven't got the Butterworth book, just everything else!! (Your comment re model answers/breaking the rule really strikes a chord with me).
Glad to be of help
In answer to your questions - a step is two consecutive next-door letters - A to B, C to D etc. It can be a whole step made of two semitones - major 2nd. Or it can be a semitone - a minor 2nd (remember leading notes usually rise). The step can go up or down.
Really important (what I read anyway) - you can't cancel out an exposed octave by stepping in the bass if there is still a leap to the top note of the octave in the soprano. If it's the other way round with a step in the soprano it's not an exposed octave in the first place. It's the leap
in the top part that is the problem but remember that the bass part has to be heading the same way in similar motion even if it is stepping - to complete the picture of an exposed octave between bass and soprano.I checked about whether all the parts having to be moving in similar motion - I made an error (oops)! - it's the bass part that has to be moving in the same direction as the soprano
I want to remember all this too