Ella Fitzgerald's first appearance at the Montreux Jazz Festival in 1969, then held at the Montreux Casino, included this scat version of "One Note Samba". She's backed by the Tommy Flanagan Trio. The YouTube video mistakenly identifies this as "a packed New Orleans" performance, even though "Montreux" is clearly visible in the background, e.g. at the 4 minute point.