5 Chord tremolos look like beams, but are a kind of repeat symbol.
6 To avoid confusion, chord tremolo beams do not reach the stems, but
7 leave a gap. Chord tremolo beams on half notes are not ambiguous,
8 as half notes cannot appear in a regular beam, and should reach the
14 \context Voice \notes\relative c' {
15 % huh -> one beam missing!
16 \repeat "tremolo" 8 { d16 e }
17 \repeat "tremolo" 4 { d e }
18 \repeat "tremolo" 2 { d e }
19 \repeat "tremolo" 1 { d e }
20 \repeat "tremolo" 1 { d e }
22 \repeat "tremolo" 4 { f'8 e }
23 \repeat "tremolo" 2 { f e }
24 \repeat "tremolo" 1 { f e }
27 linewidth = 90*\staffspace