Rodeheaver Record Company, Chicago.

Some of the recordings are by Gennett. The name behind the label, Homer Rodeheaver, was a gospel singer and trombonist, who also recorded for Victor and other companies in New York. Most, if not all of the music on Rainbow was religious insoired - gospel songs, hymns, and sacred songs. 

Record in collection:

L120 c3+ RAINBOW  Rodeheaver Record Company, Chicago.
"Ev-ry cloud will wear a rainbow if your heart keeps right". [Good grief!!]
1107-a BRIDGE THE ROAD TO HEAVEN WITH A SMILE (E. Margaret Parker). Homer Rodeheaver with Orchestra. 
1107-B THROW OUT THE LIFE LINE    Ibid.