intro

1. N-COUNT The intro to a song, programme, or book is the first part, which comes before the main part. 介紹; 導(dǎo)論[非正式] [oft N 'to' n]

...the keyboard intro to The Who's "Won't Get Fooled Again."

...誰人的《不要再次被愚弄》的電子琴簡介。