BW,
You'll also no doubt see in the example i gave, that in the second chord (G) the bass note and soprano note end up in octaves. This isn't a good idea (generally) as it weakens the structure, although many composers past and present have broken this rule with varying results. I gave it as a basic example of contrary motion.
I don't know if you understand the principle of inversions, so i'll give a brief example.
A three note C chord in ROOT position consists of: C4,E4,G4.
A three note C chord in 1ST inversion consists of: E4,G4,C5.
A three note C chord in 2ND inversion consists of: G4,C5,E5.
When you begin constructing your 4 part harmony, and you wish a smooth transition from one note to another it's good to remember inversions.
The example i gave for contrary motion was as follows.
1st chord: C3 G3 E4 G4
2nd Chord G3 B3 D4 G4
The bass is doubled in octaves with the soprano line.
Alternatives?
1st chord: C3 G3 E4 G4
2nd chord: B2 G3 D4 G4
You'll note that the bass line has gone down to the third of G. This is quite common in earlier music, but should be used wisely. Also note that your next chord because of the B2 could be C major again or A minor. (The minor of C)
Regards,
Alex.
You'll also no doubt see in the example i gave, that in the second chord (G) the bass note and soprano note end up in octaves. This isn't a good idea (generally) as it weakens the structure, although many composers past and present have broken this rule with varying results. I gave it as a basic example of contrary motion.
I don't know if you understand the principle of inversions, so i'll give a brief example.
A three note C chord in ROOT position consists of: C4,E4,G4.
A three note C chord in 1ST inversion consists of: E4,G4,C5.
A three note C chord in 2ND inversion consists of: G4,C5,E5.
When you begin constructing your 4 part harmony, and you wish a smooth transition from one note to another it's good to remember inversions.
The example i gave for contrary motion was as follows.
1st chord: C3 G3 E4 G4
2nd Chord G3 B3 D4 G4
The bass is doubled in octaves with the soprano line.
Alternatives?
1st chord: C3 G3 E4 G4
2nd chord: B2 G3 D4 G4
You'll note that the bass line has gone down to the third of G. This is quite common in earlier music, but should be used wisely. Also note that your next chord because of the B2 could be C major again or A minor. (The minor of C)
Regards,
Alex.