These two stamps from the United Arab Emirates' 1992 "Traditional Instruments" set of 6 (Sc #s 402A-F), depict contemporary Arab musicians with their instruments. The 50 fils stamps (Sc # 402B) show a seated figure playing the lute-like oud, while the 1 dinar stamp shows a pair of musicians. One man is using a tabel (hand drum), while the other is blowing on a hibban. The hibban appears to be a kind of bagpipe similar to the Tunisian mizwad.
From the arabinstruments.com website, "Oud is considered to be 'the king of instruments'. It is assumed that the name al-oud is derived from the Arabic 'the wood' and came to Europe (as the lute) through North Africa."
These stamps are the same size.