You could use an angle of view calculator like this to determine what kind of focal length you would need for the shots you are looking for:
https://www.pointsinfocus.com/tools/dep ... calculatorJust select the sensor size of the camera you are using, focal length, and distance to determine how much is included in the field of view at those settings.
For example, with a 2/3 in. sensor at 60 ft from the stage, you should be able to capture a wide shot of the entire stage (40 ft across) with about a 13mm focal length. At the tele end, if you want an upper body shot (about 2.5 ft. vertically), you'd need 160mm focal length to capture this. If you want a tighter shot (just head and shoulders), you'd need a longer focal length (about 230mm).
So you'll probably need a lens that at least spans those focal lengths (13-160mm). Many of the 20x or 22x B4 lenses cover that range. Some lenses also include a built-in 2x extender (teleconverter) that can be used for a little additional reach when needed (although there may be a reduction in quality when the extender is used).