Engraving music using Scheme expressions

You can engrave music using just Scheme expressions. Although those expressions reflect the inner mechanism of LilyPond, they are rather clumsy to use, so avoid them, if possible.

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=122


#(define (make-note-req p d)
   (make-music 'NoteEvent
    'duration d
    'pitch p))

#(define (make-note elts)
   (make-music 'EventChord
    'elements elts))

#(define (seq-music-list elts)
   (make-music 'SequentialMusic
    'elements elts))

fooMusic = #(seq-music-list
             (list (make-note (list (make-note-req (ly:make-pitch 1 0 0) (ly:make-duration 2 0))))
                   (make-note (list (make-note-req (ly:make-pitch 1 1 0) (ly:make-duration 2 0))))))
     
\score { 
  \fooMusic 
}