pre·lude 
/ˈprɛlˌju:d/ noun
plural pre·ludes /ˈprɛlˌju:d/ noun [count] 1 : something that comes before and leads to something else — usually singular — often + to ▪ The dark clouds were a prelude to the storm. ▪ Drinks and appetizers were offered as a prelude to dinner. 2 : a short piece of music that introduces a longer piece
