US and Canadian labels, part of the RCA Victor family. Bluebird was created as a discount label for jazz and blues. It was basically active from 1933 to 1945, though there have been a few re-releases since then.
Bluebird switched from the Yellow to the Blue labels starting September 1937 (so if you see a blue label on an earlier release it's a reissue).
- Related labels
RCA Victor Parent label