The \markup command is quite versatile. In this snippet, it …
tuning = \markup { \score { \new Staff \with { \remove "Time_signature_engraver" } { \… …title = "Solo Cello Suites" subtitle = "Suite IV" subsubtitle = \markup { Originalstimmung: \raise #0.5 \tuning } tagline = ##f } \layout { …