In a previous posting I mentioned that Jo Trent had gone to the west coast and was doing well in the studios. Here is confirmation. The 1930 US Census lists a Jo Trent, age 37, born in Illinois, profession "music composer," living with wife Nancy and mother in law on Clarence Avenue, LA. All three are described in the column "color or race" as "negr."
I also looked up Joseph and Joe Trent, but upon a quick examination, I did not find one to match "our" Jo Trent. I wrote to the University of Pennsylvania and asked about the possilbe enrollment of a Jo/Joseph Trent. Let's see if I get an answer.