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."
On August 2, 2018 Ireland released 8 designs from its ninth definitive series "A History of Ireland in 100 Objects" as computer-vended stamps. One of these designs is the "Loughnashade Trumpet", a Bronze Age (ca. 100 B.C.) relic in the National Museum of Ireland in Dublin.
From claddaghdesign.com website. "The decoration of the terminal disc is by far the most eye-catching aspect of the Loughnashade Horn. Hammered in high relief and mirrored in each quadrant of the ring, it features long, curving tendrils ending in spiral motifs based on the classical lotus-bud design in a perfect representation of the impressive skill of Bronze Age craftsmen."
Here are images of the four stamps in a set depicting traditional musical instruments of the Sotho (aka Basotho) people, respectively: Mamokhorong (single-string violin); Lesiba (unbraced mouth-resonated bow); Setolotolo (musical bow); and Meropa (drums), printed by lithography, and issued by Lesotho on January 5, 1975, Scott Nos. 174-177. Note: The portrait incorporated into the design on each of these stamps is of Moshoeshoe II (1938-1996), King of Lesotho.
On November 1, 2018 Ireland issued a stamp commemorating the 50th anniversary of Na Piobairi Uilleann, or The Uilleann Pipers , an Irish, non-profit organization dedicated to the promotion of the Irish Uilleann Pipes, or Irish bagpipes and its music.
a computer-vended stamp of the same design was also issued in 2018. I can find no source describing the source of the image used on these stamps. It is definitely an old Irish manuscript, perhaps the Book of Kells.
Also shown is an earlier Irish stamp (Sc #485) from 1980 which gives a better view of the Uilleann Pipes.
From Wikipedia, The Uilleann Pipes are distinguished from many other forms of bagpipes by their tone and wide range of notes - the chanter has a range of two full octaves, including sharps and flats - together with the unique blend of chanter, drones, and regulators."
This November 4, 1994 issue of Japan (Sc. #2434) is from a set of 2 "Men of Culture" and depicts Miyagi Michio (1894-1956) who was a composer and musician who played the Japanese zither (koto). A koto is also shown.
On September 2, 1993 Ireland issued 4 "Anniversaries" stamps. One of these stamps (Sc. #904) recognized the 150th anniversary of the death of classically trained composer Edward Bunting (1773-1843).
From Wikipedia, "Bunting published The Ancient Music of Ireland in three volumes. The first volume, published in 1796, contained 66 tunes which he had notated at the Belfast Harp Festival. The second volume was published in 1809. In 1840 Bunting issued his third collection of The Ancient Music of Ireland, complete with 151 tunes."
Here is a stamp (Michel #764) depicting Frederick the Great of Prussia (1712-86) as a flutist, accompanied by C.P.E. Bach on the keyboard (to the right). It was issued by Berlin on August 14, 1986 to commemorate the 200th anniversary of Frederick's death.
Stamp is a detail from the painting Flute Concert with Frederick the Great in Sanssouci (1850-2) by Adolf Menzel. Painting is in the Alte Nationalgalerie, Staatlichiche Museen in Berlin. Also shown is a closer detail from the actual painting.
The Bregenz Festival is a performing arts festival held every July and August in Bregenz in Vorarlberg, Austria. It features the world's largest floating stage, situated on Lake Constance. Here is an image of a stamp depicting the Bergenz Festival floating stage set up for a 1951 performance of Der Zigeunerbaron ("The Gypsy Baron," 1885), an operetta in three acts by Johann Strauss II, designed by Adalbert Pilch (1917-2004), printed by photogravure, and issued by Austria on July 23, 1970 to commemorate the 25th anniversary of the festival, Scott No. 877, plus a YouTube link to a short Euromaxx video about the custom set design and construction for performances of Georges Bizet's opera Carmen on the Bregenz Festival's floating stage in 2017-18.
This 5 fils Iraqi definitive stamp of the early 1970's depicts the Golden Lyre of Ur. This instrument is one of four such lyres excavated by the 1929 archeological expedition of Leonard Woolley at the Royal Cemetery of Ur. Also shown is a photograph of the bull's head decoration of the Queen's Lyre, from the same excavation.
From Wikipedia, "The Lyres of Ur are considered to be the world's second oldest surviving stringed instruments...They are over 4500 years old from ancient Mesopotamia during the Early Dynastic III Period (2550-2450 R.C.)...They were played in an upright position with the strings plucked with both hands."
On June 17, 1985 Finland issued its EUROPA set of 2 stamps (Facit #s 970-1) on the theme of "European Music Year." The lower value stamps shows children playing recorders, and the 2.10 Mk. stamps depicts "Notes and text to the song 'Ramus virens olivarum' from the song book of Turku Cathedral School Piae Cantiones (Facit)."