<p>An <strong>octave</strong> (<ahref="https://en.wikipedia.org/wiki/Octave">Wikipedia</a>) is an interval between two notes where the higher note is twice the fundamental frequency of the lower note. For example, an A at 440 Hz and an A at 880 Hz are separated by one octave.</p>
<p>An <strong>octave</strong> (<ahref="https://en.wikipedia.org/wiki/Octave">Wikipedia</a>) is an interval between two notes where the higher note is twice the fundamental frequency of the lower note. For example, an A at 440 Hz and an A at 880 Hz are separated by one octave. Here are two Cs separated by one octave:</p>
<p>A <strong>pitch class</strong> (<ahref="https://en.wikipedia.org/wiki/Pitch_class">Wikipedia</a>) is the set of all notes that are an integer number of octaves apart. For example, the set of all Cs, {..., C1, C2, ...} is one pitch class, and the set of all Ds, {..., D1, D2, ...} is another pitch class.</p>
<p>A <strong>pitch class</strong> (<ahref="https://en.wikipedia.org/wiki/Pitch_class">Wikipedia</a>) is the set of all notes that are an integer number of octaves apart. For example, the set of all Cs, {..., C1, C2, ...} is one pitch class, and the set of all Ds, {..., D1, D2, ...} is another pitch class. Here is the pitch class for C:</p>
<p>The <strong>key signature</strong> (<ahref="https://en.wikipedia.org/wiki/Key_signature">Wikipedia</a>) follows the clef on a staff and indicates the key of the piece by the sharps or flats which are present throughout the piece.</p>
<p>The <strong>key signature</strong> (<ahref="https://en.wikipedia.org/wiki/Key_signature">Wikipedia</a>) follows the clef on a staff and indicates the key of the piece by the sharps or flats which are present throughout the piece. In the Mozart sonata excerpt above, the key signature is A major.</p>
<p>The <strong>time signature</strong> (<ahref="https://en.wikipedia.org/wiki/Time_signature">Wikipedia</a>) follows the key signature on the staff and indicates the rhythmic structure, or meter, of the piece.</p>
<p>The <strong>time signature</strong> (<ahref="https://en.wikipedia.org/wiki/Time_signature">Wikipedia</a>) follows the key signature on the staff and indicates the rhythmic structure, or meter, of the piece. In the Mozart sonata excerpt above, the time signature is 6/8, i.e. six eighth notes in one measure.</p>
<p><strong>Tempo</strong> (<ahref="https://en.wikipedia.org/wiki/Tempo">Wikipedia</a>) denotes how slow or fast a piece is played as measured by beats per minute (BPM).</p>
<p><strong>Tempo</strong> (<ahref="https://en.wikipedia.org/wiki/Tempo">Wikipedia</a>) denotes how slow or fast a piece is played as measured by beats per minute (BPM). In the Mozart sonata excerpt above, the tempo marking is "Andante grazioso".</p>
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"An **octave** ([Wikipedia](https://en.wikipedia.org/wiki/Octave)) is an interval between two notes where the higher note is twice the fundamental frequency of the lower note. For example, an A at 440 Hz and an A at 880 Hz are separated by one octave."
"An **octave** ([Wikipedia](https://en.wikipedia.org/wiki/Octave)) is an interval between two notes where the higher note is twice the fundamental frequency of the lower note. For example, an A at 440 Hz and an A at 880 Hz are separated by one octave. Here are two Cs separated by one octave:"
"A **pitch class** ([Wikipedia](https://en.wikipedia.org/wiki/Pitch_class)) is the set of all notes that are an integer number of octaves apart. For example, the set of all Cs, {..., C1, C2, ...} is one pitch class, and the set of all Ds, {..., D1, D2, ...} is another pitch class."
"A **pitch class** ([Wikipedia](https://en.wikipedia.org/wiki/Pitch_class)) is the set of all notes that are an integer number of octaves apart. For example, the set of all Cs, {..., C1, C2, ...} is one pitch class, and the set of all Ds, {..., D1, D2, ...} is another pitch class. Here is the pitch class for C:"
"The **key signature** ([Wikipedia](https://en.wikipedia.org/wiki/Key_signature)) follows the clef on a staff and indicates the key of the piece by the sharps or flats which are present throughout the piece."
"The **key signature** ([Wikipedia](https://en.wikipedia.org/wiki/Key_signature)) follows the clef on a staff and indicates the key of the piece by the sharps or flats which are present throughout the piece. In the Mozart sonata excerpt above, the key signature is A major."
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"The **time signature** ([Wikipedia](https://en.wikipedia.org/wiki/Time_signature)) follows the key signature on the staff and indicates the rhythmic structure, or meter, of the piece."
"The **time signature** ([Wikipedia](https://en.wikipedia.org/wiki/Time_signature)) follows the key signature on the staff and indicates the rhythmic structure, or meter, of the piece. In the Mozart sonata excerpt above, the time signature is 6/8, i.e. six eighth notes in one measure."
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"**Tempo** ([Wikipedia](https://en.wikipedia.org/wiki/Tempo)) denotes how slow or fast a piece is played as measured by beats per minute (BPM)."
"**Tempo** ([Wikipedia](https://en.wikipedia.org/wiki/Tempo)) denotes how slow or fast a piece is played as measured by beats per minute (BPM). In the Mozart sonata excerpt above, the tempo marking is \"Andante grazioso\"."
