The American Radio Warblers, billed as canary songsters, were featured on live radio broadcasts during this era. The birds sang along with background music, and some of the recordings still exist on 78-RPM records.
3 Vees, a seed, grit and egg food company, manufactured a small cage for the Radio Warblers, and it is highly collectible today. The yellow grit cup (like the one shown here) snapped between the bars of the small cage near the perch.