Download Mathematics and Music by David Wright PDF

By David Wright

Many folks intuitively experience that there's a connection among arithmetic and song. If not anything else, either contain counting. there's, after all, even more to the organization. David Wright’s e-book is an research of the interrelationships among arithmetic and song, reviewing the wanted historical past innovations in every one topic as they're encountered. alongside the best way, readers will increase their realizing of either arithmetic and song. The textual content explores the typical foundations of the 2 matters, that are built part by means of facet. Musical and mathematical notions are introduced jointly, resembling scales and modular mathematics, periods and logarithms, tone and trigonometry, and timbre and harmonic research. while attainable, discussions of musical and mathematical notions are without delay interwoven. sometimes the discourse dwells for it slow on one topic and never the opposite, yet ultimately the relationship is validated, making this an integrative remedy of the 2 matters. The publication is a textual content for a freshman point collage path compatible for musically prone or mathematically susceptible scholars, with the rationale of breaking down any apprehension that both team may need for the opposite topic. routines are given on the finish of every bankruptcy. The mathematical necessities are a high-school point familiarity with algebra, trigonometry, features, and graphs. Musically, the coed must have had a few publicity to musical staffs, typical clefs, and key signatures, although all of those are defined within the textual content.

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Example text

Visualize the string stretching horizontally, and suppose a fret is positioned at distance L′ from, say, the right end of the string. L′ = qL 0 L fret We want to calculate the interval ratio F ′ : F , where F ′ is the frequency of the segment of string to the right of the fret. 1 to the number ϕ(F ′ : F ) = 1 L′ 1 L = L . , L′ = qL, the fraction becomes 1 L = . 6) So suppose we want to place a fret so as to move the pitch upward by a ′ specified ratio r ≥ 1. 7) Example. Suppose we want to place a fret so as to move the pitch upward a major third above F .

In the latter situation the accidental does not applies to all notes of the same note class in the measure containing the second note. Thus, in the following excerpt all Ds are D-naturals, and the second accidental is required to effect this. 2 G2 22 6ˇ ˇ ˇ ˇ ; ˇ 6˘ ˇ Sometimes, for the benefit of the reader, music includes accidentals which are not required according to the rules given above. Such redundant accidentals are called cautionary accidentals, and are enclosed in parentheses. Melody.

Hence a dotted sixteenth note’s duration in beats (still assuming for the moment that the whole note gets four beats) is given by 14 (1 + 21 ) = 14 · 23 = 38 . A second dot beside the note calls for an additional duration of one fourth the original duration (in addition to the extra duration elicited by the first dot), so that, in the above situation, a sixteenth note with two dots has duration 20 CHAPTER 2. HORIZONTAL STRUCTURE 7 + 12 + 41 ) = 14 · 74 = 16 . Although it may seem like a purely academic exercise (since only rarely are more than two dots used), we observe that a note of duration d followed by m dots has duration dm given by 1 (1 4 1 1 1 + 2 + ··· + m) 2 2 2 m i 1 =d 2 i=0 dm =d (1 + 1 − 12 =d 1− =d 2− 1 2 m+1 =d 2 1− 1 2 m =d 1+1− 1 2 m+1 .

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