The two groups of instruments then move in and out of different octaves until eventually "colliding" with each other at the same pitch.

Most include a transpose function and the ability to set different octaves.

He could play the Harmonium in two different octaves simultaneously.

There are notations for the notes in different octaves.

Inversions and retrogrades of the theme are heard throughout the movement, utilized in different octaves.

Accidentals do not affect the same note of a different octave, unless indicated by a key signature.

I recommend you learn all the scales in two different octaves.

Notes can be doubled at identical pitches or in different octaves.

The most common guitar chords have three or four notes, repeated in different octaves, a total of (usually) six tones.

The flute can be played in three different octaves.