A difficulty may pertain-to octaves.Logical formLearned from2 sentences. Octaves can be in a treble.Logical formLearned from2 sentences. A male may drop a voice an octave.Logical formLearned from2 sentences. Some pitches can be in an octave.Logical formLearned from2 sentences. (Poll trends) may add some octave to voices of concern.Logical formLearned from2 sentences. Some octave can be to voices of concern.Logical formLearned from2 sentences. Power may pertain-to octaves.Logical formLearned from2 sentences. A black hole may sing with some octaves.Logical formLearned from2 sentences. Some notes can be in an octave.Logical formLearned from2 sentences. Basses may sing in octaves.Logical formLearned from2 sentences. An alto may move across octaves.Logical formLearned from2 sentences. A person may have a range of some octaves.Logical formLearned from2 sentences. Octaves can be before a quote of a movement.Logical formLearned from2 sentences. Harmonies may end in octaves.Logical formLearned from2 sentences. Runs can be in parallel octaves.Logical formLearned from2 sentences.