printable
Rhythm
Twelve bars on one line of rhythm. What makes these worth printing is not that the durations add up — anything can do that — but that they are written down correctly: nothing is beamed across a beat, a sound that crosses one is two notes tied, and a dotted value in a simple metre starts on a beat. A function that did not build the bars checks every one of them before it is allowed on a page.
quarters and eighths
The two values everything else is measured against, and nothing shorter.
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sixteenths
Four notes to a beat, and the beams that group them.
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dotted notes
A dot adds half again. The reading problem is not the dot, it is what has to follow it.
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ties across beats
One sound written as two notes, because the beat underneath has to stay visible.
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rests
Silence measured exactly, and grouped by the same beats the notes are.
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triplets
Three in the time of two, bracketed and numbered so the eye is told before the ear is.
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syncopation
Notes that start between the beats. The exercise is keeping the beat where it was.