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Paddlers can use straight or bent shafts either solo or tandem.
As background re which type of paddle you might want to use tandem, there are two different stroke techniques to keep tandem canoes going straight instead of yawing away from the stern paddler's side: (1) single-sided correction technique and (2) hit & switch technique (AKA sit & switch or Minnesota switch).
In single-sided correction, each paddler paddles on only one side of the canoe with the stern paddler mainly in charge of providing a correction stroke—usually a J stroke—to keep the canoe going straight. While either straight or bent shaft paddles can be used, I would recommend straight paddles for beginning or intermediate tandem paddlers. Straight paddles are more effective for J strokes than bent paddles, and they are also more effective for draw strokes, pry strokes and bracing strokes.
In switch paddling, no correction strokes are used. Both paddlers just power ahead with uncorrected forward strokes. To prevent the canoe from yawing away from the stern paddler's side, the stern paddler calls "hut" every four to six strokes, at which time both paddlers switch paddling sides. And on and on and on. The constant switching keeps the canoe going straight without the need for correction strokes. Switch paddling is much easier with short, light bent shaft paddles, which can more easily clear the gunwales during an aerial hand switch than longer straight paddles can.
All flat water racers use the switch technique with bent shaft paddles. Most recreational paddlers use single-sided correction technique. Of course, you can switch sides occasionally using single-sided correction, just to change muscle groups, if the stern (or solo) paddler is adept at using the J or other correction strokes on either side of the canoe.