# Percussion and sticking

## The hand can be the note

On an unpitched percussion part, `R` and `L` are stroke notes. Durations
work exactly as they do for pitched notes. A rest is still lowercase `r`.

```scorescript
scorescript 0.3
score "Single strokes" {
  parts { snare-drum }
  snare-drum {
    staff-lines 1
    m1-2 { 4R L R L | 8R L R R L R L L }
  }
}
```

The catalog drum supplies its percussion clef. A custom part can explicitly
use `clef percussion`. `staff-lines 1` selects a one-line staff.

## Flams and drags

Use the ordinary grace slash: `/R L` is a right grace stroke into a left
main stroke; `/L /L R` is two left grace strokes into a right main stroke.

```scorescript
scorescript 0.3
score "Grace strokes" {
  parts { snare-drum }
  snare-drum { m1 { /R 4L R /L /L R L } }
}
```

Do not use `rL` as a musical note: `r` already means rest. Lowercase hands
printed by the engraver are not the source spelling of a grace note.

## Hands on pitched notes

On a pitched part, keep the pitch and attach the hand as a mark after it.

```scorescript
4C5(R) D(L) E(R) F(L)
```

Bare `R` on a pitched part is refused. Hand marks are technical indications,
not lyric syllables.

## Named rudiments

A score-level `rudiment` declares a hand pattern. An exercise's `sticking`
statement applies that pattern to its attacks. The title alone does not apply
hands.

```scorescript
scorescript 0.3
score "Paradiddle" {
  rudiment "Single paradiddle" R L R R | L R L L
  exercises {
    exercise =study {
      title "Paradiddle study"
      sticking "Single paradiddle"
      section m1
    }
  }
  parts { snare-drum }
  snare-drum { m1 { 8R L R R L R L L } }
}
```

The pattern cycles through attacks. Rests and tied arrivals consume no stroke.
An explicit hand wins while retaining its place in the cycle. Rudiment pattern
tokens can include `lR` and `rL` for flams, and roll marks such as `(trem3)`
or `(z)`; the corresponding notes must actually contain the grace or roll
structure. Mismatches are diagnosed. Rudiments and exercise collections remain
provisional language features.