There are several opinions about what intonation is and there is still a problem of defining intonation. A narrow definition of intonation belongs to a number of foreign phonetists such as Daniel Jones, O'Conner, and others: intonation is the variations of the pitch of the voice. These phonetists believe that this is only the melody of the utterance, although the pitch of the main tone of the voice is really very important in intonation.