Music Covers, not to be confused with the physical Album or CD cover, but that of the cover version, can often surprise you at how good they are.

This group of musicians, Leonid & Friends, are from of all places the Ukraine, with a version of Chicago's '25 or 6 to 4'. Really hot guitar solo, great brass section and not a trace of an accent in the vocals. Very professional video too. 

Leonid Vorobyev on bass leads the way and a full list of credits roll at the end - (lots more covers on YouTube, if you search.) From Chicago to the Ukraine > from 1969 to 2016 

(I'm indebted to my mate out there in California-land for introducing me to this). Cheers