From a website:
Both male and female] The call most associated with the Barred Owl, often described as
"who cooks for you, who cooks for you-all." I have heard from 3-note (cooks for you-all) to 12-note (who cooks for you, who cooks for you, who cooks for you-all) versions of this call. Probably the most common variation is a 7-note call, with the 5th note excluded (who cooks for you, cooks for you-all). There are also variations in the pace of the notes (see track #3), and the pitch of individual notes (e.g., for some owls the first note is higher-pitched than the second note; for others the second note is higher-pitched). This call is also combined with the series call.
As always....open to interpretation!