The second is the smallest distance between two different scale degrees. Melodies and scales are built from seconds, so recognizing them instantly is the first skill to train in interval reading.
1. Visual shortcut: spotting a second on the staff
The adjacency rule: the two notes of a second always sit on neighboring positions of the staff, so one note is on a line and the other is in the space right above or below it.
- Example in treble clef: E4 (first line) and F4 (first space).
- The two noteheads touch each other, or one is shifted slightly sideways so they do not overlap. There is never a gap between them.
2. Reference table
Here are the exact half-step counts (UK: semitones) and the harmonic classification of every second:
| Interval quality | Half steps | Harmonic classification |
|---|---|---|
| Diminished 2nd (d2) | 0 | Conditional dissonance (enharmonic to a perfect unison) |
| Minor 2nd (m2) | 1 | Absolute dissonance |
| Major 2nd (M2) | 2 | Absolute dissonance |
| Augmented 2nd (A2) | 3 | Conditional dissonance (enharmonic to a minor 3rd) |
3. Identify seconds
These exercises train you to identify major and minor seconds. Accidentals (♯ and ♭) matter: always use them to count the half steps correctly.
4. Build seconds
A root note appears on the staff. Choose the type of second and click the position of the second note.
5. Printable second worksheets (PDF)
The same two skills, on paper: one sheet to identify written seconds and another to write them. Each has 42 melodic second intervals in treble clef spread over seven staves, starting with natural, ascending notes —the major and minor seconds that come out of the natural scale— and ending with sharps and flats and mixed directions. No exercise repeats the same two notes.
Identify seconds
Under each interval there is a line to write what kind of second it is and whether it ascends or descends (M2 ↑, m2 ↓…).
Download the worksheet (PDF A4) Answers
Write seconds
The reverse exercise: the first note and the interval to form are given, and the student places the second note on the staff, with its accidental if it needs one.
Download the worksheet (PDF A4) Answers
You may print and photocopy them freely for the classroom. Each answer sheet is the same worksheet with the answers in red, so you correct by laying one over the other. The rest —including the sheets that mix several intervals— is in interval worksheets in PDF, and if you want new sheets every time or to practice on screen choosing the intervals, in the custom interval quiz.
To train your ear as well, use the reference tones of the online tuner and compare the sound of each interval with a pure tone. The online metronome helps you build sight-reading speed.