Hello Prednisolone is a steroid and is a life saving drug . It produces osteoporosis , fracture, peptic ulceration , glaucoma cataracts , pancreatitis , obesity , hyperglycemias etc but don t interfere in ADRENALINE SECRETION. So in your singing function you can do your performance but keep one thing in brain that this drug causes retention of fluid , so also on vocal cord and in that way your VOICE during singing may get changes ( however this is the adverse effect ). So be careful about that. If you think that benefits are more for its use ( of prednisolone ) then take its full course. These side effects are after prolong use , since you are tapering the drug so need not to worry. Good luck.