Primarily British; a person who arranges, organizes, or presents concerts, or who performs in concert.
From 'concertise' plus the agent noun suffix '-er,' creating the person who performs the action. The British spelling variant of 'concertizer.'
A concertiser might be a performer, a promoter, or a composer who arranges music for concert performance—it's a broader term than 'concertinist' because it doesn't require playing a specific instrument.
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