Acoustics & Sound For Musicians - Online Book

The Theory Of Sound Which Constitutes The Physical Basis Of The Art Of Music.

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	64                                 INTERVALS.                       [II. §31. convenience of reference number them 1, 2, 3......8, beginning with the lowest note which is their tonic. The following nomenclature is used to describe the intervals formed by the several notes with the tonic.
	When two notes of the same pitch are sounded together, e.g. by two instruments or by two voices, the notes are said to be in unison. Though there is here no difference of pitch whatever, it is convenient to rank the unison as an interval With this ex­planation we may add to the above table that 1 and 1 form the interval of an unison. The reader must carefully avoid giving to the ' Thirds/ ' Fourths,' &c, which he meets with in Music the meanings attached to the same words in the Arithmetic of fractions, with which they have absolutely nothing to do. A 4 Fifth,' for example, does not stand for a fifth part