When crossing the United States/Canada border, paperwork completed ahead of time can help eliminate complications and excessive fees at the border control. For Visa questions and answers go to Visa Questions and Answers on the AFM website.
TSA guide for musicians traveling with instruments
http://www.tsa.gov/travelers/airtravel/assistant/editorial_1235.shtm
Traveling with Brazilian wood bows or instrument parts
http://www.americanorchestras.org/advocacy_and_government/pernambuco_update.html
US/Canada border crossing info from Local 1000
http://local1000.com/members/visa-assistance
Lot's of good links for traveling on this page: