Edited sentence: Grofé that founded the modern style of using Jazz-Chords.It should be noted as a side-hint (that can't be confirmed anywhere), that it most probably was F.Since new or substitute musicians were often seen in Whiteman's Orchestra, there was a need to use a more modern way of reading tonality and chords to facilitate the performances.Unfortunately, there is no proof of this rumor, but makes good sense - and is very interesting to mention