Manual Improvising jazz with Markov chains

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Embeds 0 No embeds. No notes for slide. Music genre detection using hidden markov models 1. The usual bitstream encoding is the linear pulse-code modulation LPCM format. Woodwinds included the basset clarinet, basset horn, the Classical clarinet, the chalumeau, the flute, oboe and bassoon.

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Keyboard instruments included the clavichord and the fortepiano 5. Typical instruments are Double bass, drums, guitar typically electric guitar , piano, saxophone, trumpet, clarinet, trombone, vocals, vibraphone, Hammond organ and harmonica. In jazz fusion of the s, electric bass, electric piano and synthesizer were common. Typical instruments are Electric guitar, bass guitar, acoustic guitar, drums, piano, synthesizer, keyboards 6.

A HMM can be presented as the simplest dynamic Bayesian network. Each state has a probability distribution over the possible output tokens.

This module scans the current directory to find all the mp3 files. Then, each file is loaded one by one. If they are properly followed, the resulting music will not only sound harmonious, but will also reflect the music upon which it is based. Computer algorithms that generated music by these rules, then, are very likely to produce melodic music. Furthermore, a computer can check that generated music abides by these rules much more quickly and reliably than a human can.

To completely understand a jazz tune, it is necessary to be able to describe it musically and analyze it harmonically. Only when a soloist has a very deep understanding of the music they play can he even begin to synthesize their own music. Music is, at its most basic, an arrangement of sounds in time.

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Western, tonal music is based the note, a sound played for a certain duration of time. Notes are differentiated by the pitch they resonate at. Although they are technically arbitrarily many possible pitches, the human ear is essentially unable to distinguish between consecutive notes. The note C exists in multiple octaves, but its pitch is an integer multiple of the frequency of each other C below it.

The range of an instrument consists of some number of octaves — in the case of the piano, there are 8. Music is written on a staff, a set of five lines with four spaces in between.

Markov Chain

Lines and spaces on the staff correspond to white keys on the piano. The clef, written on the left at the very beginning on the piece, assigns an individual value to lines and spaces. The two most commonly used clefs are the treble G and bass F clefs. Each fixes its respective note and all the other note positions are uniquely determined. When there is no more room on the staff, it is extended with ledger lines. Music is divided into measures, each of which has a fixed length.


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Notes in a measure must be additionally described by their duration. A whole note has the longest duration of all. Notes of duration less than a quarter note are denoted with flags. Each flag halves the duration. Rests, breaks in the stream of musical notes, also have time values like notes.

Each type of note has a corresponding rest. Generally, however, rests are not dotted. Time is additionally described by a time signature and a tempo. The tempo describes how fast the music is played. This can be either a word like allegro , or an actual BPM value Notes in a tune can be individually modified as well. A note can be played legato, meaning smoothly, or staccato, meaning choppily.

A slur line over a series of notes is used to designate the former; the latter is indicated by a dot beneath the note. Time signature describes the amount and type of notes in a measure.

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The upper value of a time signature gives the number of notes in a measure, and the lower value gives the type. The difference is in meter. Introduction to Music Theory, retrieved October 20th , 2 Computer Synthesis Meter can be either simple or compound. In simple meter, a beat can be broken down into two notes.

In compound meter, the beats are divided into three notes. Odd meter is some combination of the two. So is his Take Five. Both are jazz standards, but are clear exceptions. The Real Book, Rather than working in terms of notes, most music is conducted in terms of the interval. That way, the music can be transposed shifted up or down to yield the same song, just in a different key.

A half step is the distance from one key on the keyboard to the next adjacent key. A whole step is the same as two half steps. Nearly all scales, which form the basis of all music, are composed solely of whole and half steps in different combinations. As a result of the way the staff is constructed, it is impossible to play anything other than a white key without adding notation to denote moves by a half step.

These are called accidentals.

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An accidental can be either a sharp or a flat b , sharps raising the note by a half step and flats lowering them by the same amount. This means that a note can usually be written in many ways. Consider, for example, the note a half step above C. We could write that note as C , but also as Db.


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In fact, since sharps and flats allow multiplicity, we could write it as B double sharp or D double flat. Although these distinctions do not make any difference on their own, they depend on, and are central to, key of the tune. Music is based on scales. The two simplest types of scales are the major scale and the minor scales. To construct the major scale of some note X, simply start X and play whole, whole, half, whole, whole, whole, half, where the intervals stack.

There are several types of minor scales : the natural minor, harmonic minor, and melodic minor. The natural minor is given by the sequence whole, half, whole, whole, half, whole, whole. The harmonic minor is given by sharping the 7th scale tone of the natural minor. The melodic minor is obtained by raising the 6th and 7th scale tones of the natural minor by a half step. Scales give rise to the next basic musical construct — the notion of key. The key of a tune is the scale upon which the notes of the melody are based.

For brevity, the sharps and flats are placed once that the beginning of the tune, and are implied on all affected notes throughout. This is the key signature. Because there are no sharps or flats in the key C major, there is no key signature. C minor has 3 flats — E, A, and B. Thus, the three flats are placed on the corresponding lines and spaces at the very beginning of the tune, and are implied everywhere else unless otherwise stated.

There are a total of 15 major key signatures and 15 minor ones Humphries, Major Keys. Figure 2. Minor keys. The 15 minor keys in music are uniquely determined by their key signature, which can range from 7 flats to 7 sharps. Scales are also the root of the most fundamental concept in jazz and in most music : the chord.