Roberts is reported to have had very large hands, which allowed him to span 14 keys on the piano, and his right hand was particularly fluid. He played for the Vanderbilts, Astors, and other wealthy families in New York.
In his book, The 101 Best Jazz Albums, Len Lyons recommends the album, Luckey and the Lion: Harlem Piano (Good Time Jazz). (Buy the CD at Barnes & Noble.)
Roberts plays his "St. Louis Blues" here:
Robert
http://www.facebook.com/corejazz?sk=wall