20. Reading Wider Gaps (4ths & 5ths)

Theory Lesson: Stretching the Hand

As the chords you play get wider, you won't have time to stop and count every single line and space on the staff. Instead, you need to recognize the visual shape of the gap. Today, we stretch the hand a bit further to read 4ths and 5ths.

Spotting the 4th

A 4th spans four notes in a scale (like C up to F). Visually, a 4th always looks "mixed" on the staff:

• If the bottom note is on a Line, the top note is on a Space.
• If the bottom note is on a Space, the top note is on a Line.

It looks like a medium-sized gap on the page. When you see this mixed shape, your hand will naturally open up, usually stretching from your thumb (1) to your ring finger (4).

White Key 4ths in C Major

If you stick entirely to the white keys, almost every 4th you play will sound perfect and balanced (a Perfect 4th). There is only one exception on the whole keyboard: F-B. This creates a very tense, spooky sound called a Tritone (which we'll explore later!).

Spotting the 5th

A 5th spans five notes (like C up to G). It is the powerful, stable anchor of almost all modern chords. Visually, a 5th is perfectly symmetrical—just like a 3rd, but with a clear gap in the middle:

• Line to Line: (Skipping exactly one empty line in the middle).
• Space to Space: (Skipping exactly one empty space in the middle).

When your eyes see this empty line or space floating between two note heads, your hand should automatically lock into a wide shape, using your thumb (1) and your pinky (5).

White Key 5ths in C Major

Just like 4ths, staying on the white keys gives you beautiful Perfect 5ths almost everywhere. The only crunch happens on B-F (our old friend, the Tritone).

Self-Check Questions

1. Question: If the bottom note is on a space, and the top note is on the very next space above it, what is the interval?
   Click to reveal answer

   Answer: A 3rd! (Because there is no gap in the middle).
2. Question: If the bottom note is on a space, and the top note is on the second space above it (leaving an empty space between them), what is the interval?
   Click to reveal answer

   Answer: A 5th.
3. Question: What fingers do you normally use to play a Perfect 5th?
   Click to reveal answer

   Answer: The thumb (1) and pinky (5).