APMsomeone who often goes to concerts, or someone who is at a particular concert 音乐会的常客;听音乐会的人
Examples from the Corpus
concertgoer• San Diego police took 21 Metallica concertgoers to a detox center and eight others were arrested for public drunkenness.• Ads for her current tour have suggested that concertgoers bring canned food for local food banks but specify vegetarian food only.