The Pearly Band is a group of musicians from Mary Poppins. They're all dressed up in pearl buttons and sing "Supercalifragilisticexpialidocious". A lady in a magenta dress plays the tambourine, a short man in a black suit plays the bass drum, a tall man in a black suit plays the double spoons, another short man in a black suit plays a stringy click instrument that looks like a banjo with a cymbal attached to it, and a lady in a blue dress plays the violin. Only the short man on the bass drum speaks.
The drummer and violinists also make a cameo appearance in "101 Dalmatians II: Patch's London Adventure": the violinist in a phone booth, and the drummer walking two Great Danes, during the "Twilight Bark" Scene.