Way Back Wednesday = Daf or Def A daf is a large-sized tambourine used to accompany both popular and classical music in Iran, Azerbaijan, Turkey (where it is called tef), Uzbekistan (where it's called childirma), India (where it is known as the Dafli) and Turkmenistan. Daf typically indicates the beat and tempo of the music being played, thus acts like the conductor in the monophonic oriental music.

For more on middle eastern instruments:
http://en.wikipedia.org/wiki/Def_(instrument)#Buben

Tambourine – Wikipedia, the free encyclopedia
en.wikipedia.org
The tambourine is a musical instrument in the percussion family consisting of a frame, often of wood or plastic, with pairs of small metaljingles, called "zils". Classically the term tambourine denotes an instrument with a drumhead, though some variants may not have a head at all. Tambourines are of…