I really enjoy The Analogues and their note perfect renditions of the Beatles catalogue so it was a nice surprise when I came across Leonid & Friends who are a Russian/Ukrainian/Molodovan/Belarusian band who specialise in covering music by Chicago. I was a big fan of Chicago back in the day, particularly their first 5 albums, and Leonid & Friends cover their music with astonishing skill and attention to detail. They also cover Earth Wind & Fire superbly. Well worth checking out on YouTube.