The clock tower in London's parliament, Big Ben, is once again singing its sweet tune.

The melodic quarter-hour chimes that come before the classic 12-ton Big Ben bell have completed their repairs.

Engineers finished over a month of repairs, fitting the four bells with two new hammers from the Whitechapel Foundry in east London, extending a tradition began in 1859.

According to Canadian CNews, the Westminster chime tune, said to be based on two measures from Handel's The Messiah, was composed originally for the bells of Great St. Mary's Church in Cambridge, where a new clock was installed in 1793. The identity of the composer is uncertain, though the leading suspect is William Crotch, a child prodigy who was an assistant organist at King's College in the city.