97.5 Y-Country Summer Jam 2017 with A Thousand Horses in St. Joseph MI 5 Aug, 2017 John Kosiewicz Concert Reviews, Country, Pop, Southern Rock On August 5, 2017, 97.5 Y-Country hosted their annual Summer Jam Concert in St. Joseph MI. Summer Jam started in 1998. After two previous locations in Michigan’s Great Southwest, Y-Country Summer Jam has settled …