preluder
/ˈprɛljʊdər/Definitions
1. noun
A preliminary or introductory performance or event, especially in music, that prepares the audience for a main work.
“The orchestra’s prelude to the opera was a beautiful rendition of a famous melody.”
2. verb
To serve as a preliminary or introductory performance or event.
“The singer preluded the main concert with a soft, soothing melody.”