The River Raisin Ragtime Revue (R4), is a 13 member musical group that specializes in the history and performance of ragtime and early jazz music.  R4 has performed at Greenfield Village as part of the Ragtime Street Fair and as the opening act for the Detroit Symphony's Salute to America. "R4" mission is to offer accessible education and entertainment of the highest level through the performance, preservation and restoration of significant American music.