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Interval

Octave
12 semitones.

A octave sounds the same note, doubled. The fastest way to recognize it is the opening of Somewhere over the Rainbow.

  • Play it on piano
  • P8 · 12 st
  • Same songs as the trainer

Octave

Hear the octave from middle C

The octave is 12 semitones (P8). From C4 at 261.63 Hz the upper note is C5 at 523.25 Hz, a frequency ratio of 2.0000.

Ascending hookSomewhere over the Rainbow
Descending hook—
Characterthe same note, doubled

Sing the opening of Somewhere over the Rainbow and you are singing this interval upward. The trainer does not assign a descending song for this one. The interval trainer uses these same hooks.

All twelve

StudioEars app icon
StudioEarsEar training for iPhone & iPad

Recognize it without the song hint.

The app drills this interval against the ones you confuse it with, and keeps score across days.

Download on theApp Store

Free to start. 5 free training units every day plus built-in studio tools.

  • EQ & compressionDaily drills on drums, bass, guitars and full mixes.
  • Intervals & chordsPiano training that uses the same note names as these pages.
  • Studio toolsMetronome, tone generator and tap tempo live in the app too.

Explore the cluster

Major 7th One step smaller. Previous interval → Minor 2nd One step larger. Next interval → Interval trainer Name it from a random root. Train →

FAQ

Octave questions

How many semitones is a octave?

12. Stack them from any note and you land 12 keys away on the piano, counting only the destination.

What song starts with it?

Ascending: Somewhere over the Rainbow. The trainer does not assign a descending song for this one.

How do I practice it?

Play the buttons above, sing the hook, then do a round in the interval trainer with only this interval and its neighbors turned on.