Basie and Ellington vocalists.

[jazzbo]

Clark Terry is another that was in both bands.

I'm not sure I agree with you re: Betty and Al, and I don't think appearances in listing is an accurate way to assess real merit. . . and so much depends on how loosely one defines "jazz."

[clinthopson]

Without a doubty Betty Roche sang the hippest version of "A-Train" ever recorded.

"Opp bop a shoobe do, a oop bop a shoobie do. . ."

But no other band ever had boy singers the equal of Jimmy Rushing and Joe Williams.