Common Music Notation (CMN) repertoire component declarations.
<beam>A container for a series of explicitly beamed events that begins and ends entirely
within
a measure.
<beamSpan>Alternative element for explicitly encoding beams, particularly those which
extend across bar lines.
<mRest>Complete measure rest in any meter.
<oLayer>A layer that contains an alternative to material in another layer.
Component declarations that are shared between two or more modules.
<chord>A simultaneous sounding of two or more notes in the same layer *with the same
duration*.
<layer>An independent stream of events on a staff.
<rest>A non-sounding event found in the source being transcribed.