Local hip-hop act Atmosphere canceled a show in Toronto tonight after Canada apparently banned their entry into the country. A message on the group’s Facebook page last night says the show was scrapped “due to an immigration issue.”

Their publicists released a short and vague announcement: “Attention Canadians! Tonight’s Atmosphere performance in Toronto at the Opera House has been canceled due to border restrictions put in place by the order of the Canadian government and her queen. We regret the inconvenience. This show will be rescheduled for a later date.”

The Wall Street Journal wrote last fall that musicians are having increasing difficultly getting visas to perform across borders, even as the Internet makes their music more accessible around the globe. Are Slug and crew caught up in the same security trend that kept Brit Amy Winehouse from attending the Grammys?