Horizontal beams

Horizontal beams can be forced, regardless of the positions of the notes they connect.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=757

\relative c' {
  \override Beam.concaveness = #10000
  f,16 e' d' c'
  a16 c, e, c 
  b16 f' c' g'
  \stemDown
  d,16 g c f 
}