intro
US
UK intro n: informal, abbreviation (music: introduction) (introduction的缩写形式)
SC 歌曲的引子，序曲 gē qǔ de yǐn zi，xù qǔ
The piano piece included a short intro.
intro n as adj: informal, abbreviation (introductory)
SC 前奏的, 前言的
I realised my favourite TV show was starting when I heard the intro music.