Damn, you're right. I always assumed Joplin was Canadian when it was her band members who were Canadian.

From her wiki:

Around this time, she formed her new band, known for a short time as Main Squeeze, then renamed the Full Tilt Boogie Band.[13][16][22] The band comprised mostly young Canadian musicians previously associated with Ronnie Hawkins and featured an organ, but no horn section. Joplin took a more active role in putting together the Full Tilt Boogie band than she did with her prior group. She was quoted as saying, "It's my band. Finally it's my band!"

I didn't know before today. Thanks.

Late Edit:

I dunno if it's Festival Express or not. She's dressed as though it is. I just can't find the Festival Express documentary online.