Song key correction plugin?

Anyone know of an online service or a plug-in that can automatically, chromatically, do minor adjustments to the key of non-vocal music tracks. I have a set of rehearsal backing tracks that my music director says are anywhere from 25 to 50 certs sharp. My ear is not good enough to detect the error. I can manually drop each track by 50 certs, but I won’t know if the correction is right for each song. I could sit down with music director and go through songs one by one, but I’m thinking there could be an app or plug-in the could do this automatically. Any ideas?

Thanks