[78-L] some missing male vocal ranges 1905-1026

[Malcolm Rockwell]

I have just finished making a list of the common vocal ranges of US male 
performers that recorded some Hawaiian or hapa haole material 
(acoustically) from c. 1905 to c. 1926.

There are four men whose vocal ranges I cannot seem to locate:

Arthur Hall

Billy Hillpot

Harold Lambert

John Ryan


and two whose ranges I may have mixed up:

Gus Van (baritone, I believe)
  Joe Schenck (tenor, I believe)


Any help here greatly appreciated!
Malcolm Rockwell