Originally Posted by: icebreaker1588yes! so excited to learn how this works! Thanks so much for replying!!!!!
[/quote]
You're welcome! It's fun stuff. :)
[QUOTE=icebreaker1588]
Alright so now i'm a bit confused though. You're talking about a melody being a 3rd or 6th higher. How do I know which octaves are X higher/lower than the other one? When I harmonized my melody I just chose a spot where it would be easy to play.

An octave is a specific interval of an 8th. To play a harmony of an octave means to double the melody 8 scale degrees higher or lower than the original notes of the melody. Harmonizing at an interval of a 3rd means to double the melody 3 scale degrees higher or lower. All harmonies are done at some specific interval distance. I cover this in great depth with lots of examples in the tutorials.

Let's use this simple melody in C major as an example.

|--------------------------------------------|
|------5-------------------------------------|
|-5-7----7-5---------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|

3 notes: C-D-E-D-C. Very simple little phrase. Think of them as scale degrees in C major.

E ||---|---|---|---|---|---|---|---|---|
B ||---|---|---|---|-3-|---|---|---|---|
G ||---|---|---|---|-1-|---|-2-|---|---|
D ||---|---|---|---|---|---|---|---|---|
A ||---|---|---|---|---|---|---|---|---|
E ||---|---|---|---|---|---|---|---|---|

C - 1
D - 2
E - 3

So, in scale degrees, our phrase is 1-2-3-2-1.

Let's harmonize it one octave below. That means the same scale degrees, but down 1 octave. This is also an interval of an 8th below.

|--------------------------------------------|
|------5-------------------------------------|
|-5-7----7-5---------------------------------|
|------2-------------------------------------|
|-3-5----5-3---------------------------------|
|--------------------------------------------|

Melody:
C - 1
D - 2
E - 3

Harmony:
(all one octave lower)
C - 1
D - 2
E - 3

Now let's harmonize it a 3rd above.

|-------3------------------------------------|
|-5-6--5-6-5---------------------------------|
|-5-7----7-5---------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|

Melody:
C - 1
D - 2
E - 3

Harmony:
(all a 3rd higher)
E - 3
F - 4
G - 5

So our melody is still 1-2-3-2-1.
But our harmony is 3-4-5-4-3.

In order to find our harmony interval distance of a 3rd we counted 3 scale degrees up from C to E & so forth to find the harmony for each note of the melody.

C to E (1-2-3)
D to F (2-3-4)
E to G (3-4-5)

Make sense?

We create a harmony of a 3rd higher by playing another note from the same scale an interval of a 3rd higher on that scale.

Let's try a 3rd lower

|--------------------------------------------|
|------5-------------------------------------|
|-5-7-5--7-5---------------------------------|
|-7-8----8-7---------------------------------|
|--------------------------------------------|
|--------------------------------------------|

Melody:
C - 1
D - 2
E - 3

Harmony:
(3rd lower)
A - 6
B - 7
C - 1

3rds & octaves are basic way to harmonize & the intervals most commonly used. But you can use any interval. Exploring possible harmonies is fun! :)