A language […] may have special features of stress, tone, drawl, etc., stretching over phrases, sentences, etc. All these features are phonemic if they are necessary to a bi-unique correlation between our description and the spoken utterance. All of them are non-successive in the sense that segmental phonemes are successive, since they do not occur between one such phoneme and the next, but are simultaneous with some phonemes (usually a vowel), or with a syllable.
- Harris (1942b), a pag.242