Like traditional didgeridoos, modern didgeridoo innovations produce a drone sound and are classified as aerophones. Multidrone didgeridoos have been created by William Thoren, a U.S didgeridoo player and crafter. Instruments included didgeridoos, slide guitars, stomp boxes, djembe drums, slit drums, and the harmonica. For socializing, a player can obtain musical instruments&colon; wooden horns, maracas and didgeridoos. Eucalypt wood is also commonly used to make didgeridoos, a traditional Australian Aboriginal wind instrument. I use all these (aboriginal instruments such as didgeridoos) but I still play country music. The Goodies dress like the Pied Piper of Hamelin, and play didgeridoos. Sullivan, Schilling, and Elley criticized its soundtrack, especially the use of didgeridoos. This enables the pitch to be varied mid-song, unlike traditional didgeridoos. When dried out, the stalks can be used to make didgeridoos. Didgeridoos from north-east Arnhem Land are instruments of the highest cultural integrity. Didgeridoos are traditionally made of eucalyptus, but contemporary materials such as PVC piping are used.