Unusual graphical crescendos (cosmetic Hairpin styles)

By overriding the 'style property of the Hairpin object, you can get nice contemporary crescendos and decrescendos.

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=339

\relative c' {
  \override Hairpin.style = #'trill
  c2\< c\!\mf
  \override Hairpin.style = #'zigzag
  c2\< c\!\mf
}