Here is an example of what intervals look like when engraved in the theory line:

To enter an interval, type the interval's quality and size in the text input box.

Interval Quality

The interval quality represents the type of interval being described:

interval quality:	diminished	minor	major	perfect	augmented
text input:	o, d	m	M	p	+, a

• To input a minor interval, type the lower-case letter 'm'.
• To input a major interval, type the upper-case letter 'M'.
• To input a perfect interval, type the letter 'p'.
• To input an augmented interval, type the plus sign '+' or the letter 'a'.

Note: the diminished and augmented qualities will always be engraved as ° and + in the theory line.

Interval Size

The interval size is the number of lines and spaces the interval spans, starting with 1 for unison:

interval size:	unison	second	third	fourth	fifth	sixth	seventh	octave	ninth	tenth	...
text input:	1	2	3	4	5	6	7	8	9	10

Numbers up to and including the octave are called simple intervals and intervals larger than the octave are compound intervals. When the users are asked to identify a compound interval, both the compound or its simple version are accepted. For example, a written major tenth can be correctly identified in the theory line by typing either M10 or M3. However, the reverse is not true: if the written interval is a minor second it is incorrect to identify it as m9, the only correct answer is m2.

Typing in the Theory Line

To type intervals in an interval assignment, please follow the steps:

1. Click on an entry box for the theory-line editor to pop up just beneath the theory line.

2. Type the quality and size of the interval as described above into the theory-line editor. As you type, your input will be engraved in the theory line into proper music notation.

3. When you are finished typing, press the Enter or Return key or use the Tab key to move to the next entry in the theory line.