| Date | Country | Topic |
|---|---|---|
| 1.3.2021 | Liechtenstein (1v1) | 75th anniversary of the Operetta Balzers |
| 12.3.2021 | Slovenia (1v1 / Block) | Slovenian inventors Ivan Bajde (1855 - 1920) Inventor of the piano harp |
| 13.3.2021 | Slovakia (1v1) | 100th anniversary of the Slovakian Teacher's Choir |
 19.3.2021 | France (1v1) | 100th memorial anniversary Camille Saint-Saens |
| April | Austria (1v1) | Musical instruments: clarinet |
| April | Poland (stationery) | 150th anniversary of the Music Society "Stanislaw Moniuszko" |
| 19.4.2021 | Croatia (2v3) | Famous Croats: Antun Mihanovic (1796 - 1861) Poet, lyricist of the Croatian national anthem Ljiljana Molnar-Talajić (1938 - 2007) Opera singer |
| 13.5.2021 | Ireland (4v4) | Irish singer songwriters |
| 19.5.2021 | Czech Republic (4v4) | Gustav Brom (Jatt musician) |
| 20.5.2021 | Germany (1v1) | Musical instruments: harmonica |
| 28.5.2021 | United Kingdom probably 8-10 stamps | Music Giants - Paul McCartney |
| June | Poland (1v1 / Block) | Ancient Organs |
| 14.6.2021 | Belgium (5v5 / Block) | Belgian DJ's |
| July | Poland (stationery) | 100th birth anniversary Francizek Walicki Music producer |
| 7.10.2021 | Germany (1v2) | German Legends: The Nibelungs |
| 7.10.2021 | Ireland (4v4) | 150 years of Gaiety Theater |
| 20.10.2021 | Aland (1v2) | Christmas: Christmas music  |
| October | Poland (1v1) | Int. Violin-Contest "Henryk Wieniawski" |
| 2.11.2021 | Germany (1v1) | 100 years of the German Dance Sports Association |
| Date unknown | Ukraine (1v1) | 100th anniversary of the first performance of the Ukrainian Christmas carol "Shchedryk" in New York |
| Date unknown | France (1v1) | 100th birth anniversary George Brassens |
| Date unknown | Canada (2v2) | Legends of the Canadian Ballet |