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Keywords are:  'musical instruments performance performing polyphonic drone rhythm'

perform [instrument] <args> - play a musical number with an instrument

perform notes    - the number of notes you can play in a performance
perform list     - see the types of instruments you have performed with
perform help     - syntax for the perform command

set midi <0-100> - midi playback controls (client dependent)

To perform, you must have an instrument wielded, held or worn around
your neck. There are certain large instruments, like pianos and organs,
that can be played as long as you are in the same room. You can play
while sitting or standing. Performing with instruments consumes a small
amount movement or mana, depending on whether or not the instrument is
magical in nature.

The number of notes you can play in a performance depends mostly
on your intelligence and little bit on your charisma.

Some instruments, mostly drums, are rhythm only, and can play only
a single note.

Some instruments, such as bagpipes, have a drone that plays a set
note continuously throughout a performance.

Some instruments are polyphonic and can be used to play both chords
or individual notes.

The musical notation is as follows:

Single notes have 2 to 4 components:

Accidentals: # for sharp, & for flat (this is optional)
Pitch:       a-g baseline, prefix + for high notes, - for a low notes
Duration:    1-9 beats

Note: rhythm instruments cannot have a note designated and will
always play the same note. Only a duration needs to be designated.

Example: 
#+a4 - high A sharp for 4 beats

Chords have 4 to 5 components:

Mode:       M - major, N - minor, U - augmented, I - diminished
Accidental: # for sharp, & for flat (this is optional)
Key:        root note of the chord, same usage as single notes
Duration:   1-9 beats

Example: 
M+c3  - High C major chord for 3 beats

Rests have 2 components:

R (for rest)
Duration: 1-9 beats

Example:
R2  - Rest 2 beats

Advanced options:

Starting a performance with 's3' increases the duration of notes by 50%
to approximate a 3 beat measure.

Duration for individual notes can be substituted with "t", which has a
very short duration. Multiple notes, chords or rests can be parsed in
this way in succession to produce something approximating a trill.

For extended keyboard instruments, you can play two octaves above or
below the tonic with '>' and '<' in place of of '+' and '-'.

Chords can be inverted by adding 'v' or 'o' behind the letter notation,
before the duration. The former designates a first inversion, the latter
a second inversion.

For polyphonic instruments with an extended range, you can add an
additional note or chord. Use an 'l' in place of a duration for the first
note or chord, then add the notation for the second note or chord as
normal, with no space between the two. For example 'm+alme4' would play
both the high A major and E major keys.

You cannot start or end performances with a rest, nor can you have
two or more rests in a row. A rest will not stop a drone from playing.