Open boarders(once upon a time it was easier to get into Canada than                  to get back into US)
Stan Rogers (as already mentioned)
Garnet Rogers
The Arrogant Worms
Several of our Iranian hostages.
Quality ginger beer at affordable prices.
Ditto for fish 'n chips.
The Frantics.
The Royal Canadian Air Farce.
La Bottine Souriante (still canadian, er, canadien, for now)

A good whuppin' ever now and then.

Been there when we needed them.