OTTAWA -- As thousands of pot activists lit up a spliff Tuesday on Parliament's front lawn in support of legalizing marijuana, the folks who make the bells ring in the capital's iconic Peace Tower decided to make them feel right at home.

The noon-hour programme for the Peace Tower Carillon included some hippie favourites including "Puff the Magic Dragon", made popular by Peter, Paul and Mary, and John Lennon's classic "Imagine."

The 53 bells that hang inside the Peace Tower ring out a different set of pieces at noon, normally drawing from a classical repertoire.

The annual 4/20 demonstration is one of the largest annual protest gatherings on Parliament Hill and sunny skies and mild temperatures in the nation's capital helped boost this year's turnout.