They murdered the anthem

By that night the internet had a verdict: they had "murdered A Portuguesa". Some talked about fado, some talked about a crime. The earpiece was still missing somewhere at the racetrack. Four people and an earpiece: one person per row, one per column. Whoever is left alone with it in the same room is the one you're looking for.

Suspects

• Aurélio, the barman: He heard the anthem on the bar's TV, with the volume on minimum. He says it was great.
• Benedita, the first aid nurse: She treated two falls and a gentleman who choked on the chorus. Nothing serious.
• Cláudio, the fan who came specially: He drove five hundred kilometres to hear the duo. He heard them, loved it, and only found out it was a crime when he got home.
• Doroteia, the social media manager: She streamed the anthem live on the official account. By ten that night she had switched the comments off.