LONDON (Reuters) - Former Beatle Paul McCartney is to release his third classical album next month -- ``Working Classical'' -- which is a play on words about his working-class roots.

The album, being launched next month with a special concert in his home town of Liverpool, contains 14 compositions that are being performed by the London Symphony Orchestra and the Loma Mar String Quartet.

In a statement Wednesday, McCartney said the title was light-hearted wordplay. ``I'm very proud of my working-class roots,'' the multi-millionaire said.

``A lot of people like to turn their backs, especially when you get a little bit elevated in life, so I am always keen to remind people and myself of where I'm from.''

McCartney's two previous classical works were 1991's ''Liverpool Oratorio'' and 1997's ``Standing Stone.''