Looks like Petro-Canada’s trying to woo listeners with their siren song, as the brand takes the top spot in the race for the most ads on rotation in the Toronto market last week. Just behind the gas giant is TV juggernaut CTV (at number two) and budget furnishing brand Ikea (at number three, leaping from number 12 last week). Over to the categories list and restaurants again sit at number one, with 41 different advertisers for the broadcast week. Check out others topping the radio charts by category and brand in the Toronto market for the week of Jan. 21-28.