Yorkshire schoolboy Garna Wallace, 12, left his £1,000 instrument on a bus seat earlier this week.
The Stockport branch of fast-food restaurant McDonald's has started playing classical music late at night in an attempt to put an end to rowdy behaviour.
Though the technique has been used by Stockport council in the past, this is the first time classical music has been used in this way inside a local business.
After rises in anti-social behaviour in the area around the Grand Central branch of McDonald's, the restaurant has been piping in the music of Beethoven, Brahms and more to try and pacify the more boisterous late-night customers.
The branch is very close to several clubs and pubs and is a popular destination for revellers after closing time. Councillor Philip Harding commented: "The idea is they would disperse as it's not their scene. I believed it was successful [in the town centre] but it's a bit of a different suggestion inside a business."
He added: "I like classical music but I'm not sure the patrons of McDonald's do."