The event, which raises food and cash donations for local food banks, began with a special edition of Metro Morning hosted by Matt Galloway before a live audience from the Glenn Gould studio.
As the day began, the event had already raised $37,760 with that total set to climb throughout the day. Last year, Sounds of the Season raised almost $500,000 over the course of December.
Gail Nyberg of the Daily Bread Food Bank spoke on stage and said area food banks handled one million visits last year, with one third of those clients were children.
Sounds of the Season events will continue throughout the day at the Broadcast Centre. Click here to see a full schedule of the day's events.
Scheduled performers during the Metro Morning broadcast include Walk Off The Earth, Serena Ryder, Nikki Yanofsky and others.
Special programming will continue all morning on CBC Radio One. On television, Friday's broadcast of CBC News Toronto with Dwight Drummond and Anne-Marie Mediwake will be produced live in the CBC Atrium starting at 5 p.m. Joining them will be Canadian astronaut Commander Chris Hadfield and high-school singing sensation the Wexford Gleeks.
There is also a silent auction, will dozens of items up for grads with proceeds going to local food banks.