Vorspiel
antecedence
antecedency
anteposition
anteriority
avant-propos
breakthrough
concert overture
curtain raiser
descant
dominion
dramatic overture
exordium
forerun
forerunner
foreword
front matter
front position
frontispiece
harbinger
innovation
introduce
introduction
leap
operatic overture
overture
postulate
preamble
precedence
precedency
preceding
precession
precursor
preface
preference
prefix
prefixation
prefixture
preliminary
premise
presupposition
priority
proem
prolegomena
function
inception
origin
origination
play
serve
spiel
preluded
preludes
preluding
accompaniment
acura
aria
climax
colouring
concerto
duet
finale
interlude
irony
melody
pageant
peroration
pose
prologue
refrain
repast
symphony
write