On Monday, Oct 30, 2006, at 06:43 America/Los_Angeles, David Rastall 
wrote:

> Minor seventh chords?- I thought they would have been rarely used back 
> then.- I was assuming that a chord with a seventh added should take a 
> major third.

A dominant seventh is, strictly speaking, a seventh chord on the 
dominant.  Excuse the lecture if you already know about this, but there 
is a set of defaults known as the "rule of the octave,"  which says 
that in the absence of figures you play a root position chord on the 
all the diatonic notes of the scale except the third and seventh (some 
sources also include the sixth) which take a first inversion (i.e. the 
figure 6), and all raised tones also take a 6.  So in C major, D, will 
be minor, and so will E and A if they are root position and not 6 
chords (i.e. e minor and a minor and not C major and F major), which 
will be the case if they have a seven under them.  So in this passage 
from a Telemann recorder sonata in C:

E A D G C
7 7 7 7

You get four sevenths in a row, and three of them are minor sevenths.  
There are similar passages in Corelli, I'm sure.

> So any time we see a figured bass, we are looking a part that could 
> have been written by the composer, the publisher, the editor, or maybe 
> even the last person to have used that sheet music?

All are possible, and you probably listed them in decreasing order of 
probability.  And it can get a lot more complicated than that.
If you're lucky, the modern editor will tell you all about it.  For 
your immediate purposes, it's not critical; if you're learning how to 
play a 7-6 suspension, it doesn't really matter who wrote it.

> --I have one more question:--where do I have to go to find editions of 
> sonatas, arias, canzone etc. that contain figured bass parts, and not 
> some ridiculous piano or (worse yet) guitar accompaniment part?

Why not start here:

http://icking-music-archive.org

There's probably lots of good stuff in Gordon Callon's online archive, 
for which I don't seem to have the URL.

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