Inserting score fragments above a staff, as markups

The \markup command is quite versatile. In this snippet, it contains a \score block instead of texts or marks.

\version "2.24.0"

tuning = \markup {
  \score {
    \new Staff \with { \remove "Time_signature_engraver" }
    {
      \clef bass
      <c, g, d g>1
    }
    \layout { ragged-right = ##t  indent = 0\cm }
  }
}

\header {
  title = "Solo Cello Suites"
  subtitle = "Suite IV"
  subsubtitle = \markup { Originalstimmung: \raise #0.5 \tuning }
  tagline = ##f
}

\layout { ragged-right = ##f }

\relative c'' {
  \time 4/8
  \tuplet 3/2 { c8 d e } \tuplet 3/2 { c d e }
  \tuplet 3/2 { c8 d e } \tuplet 3/2 { c d e }
  g8 a g a
  g8 a g a
}