Here are a few sources that I find useful. It includes organizations, blogs, Facebook groups, and individual articles. I hope you will enjoy discovering the world of music on stamps.
General Information and Articles:
Motivgruppe Musik – An international philatelic study group of stamp collectors interested in Music on stamps
Henry Steinway Philatelic Collection – The private collection of Henry Z Steinway former president of Steinway pianos is now at the Museum of Making Music in Carlsbad, California.
Jascha Heifetz Collection Finding Guide – The collection of famed violinist Jascha Heifetz is at the Smithsonian Institution’s National Postal Museum. This is a link to the collection’s finding guide.
From Music to Meme – Blog post from the British Library
The Digital Philatelist – This link features additional music stamp media including Youtube videos and podcasts
Classical Music on Stamps
Classical Music on Stamps – An English-language facebook group devoted to classical music stamp topic
Music Philatelics – a Facebook group devoted (mostly) to classical composers
The Most Beautiful Classical Music Postage Stamps – Article by classical fm
Classical Music on Stamps – Article by MusicWeb
Composer Stamps
Bach on Stamps – A list of stamps featuring Bach alphabetically by country
Bach über Bach – A German and English-language blog devoted solely to stamps featuring Bach
Beethoven – ein Markenzeichen – German-language facebook group devoted to stamps featuring Beethoven
Beethoven on Stamps – English-language site devoted to stamps featuring Beethoven
Russian Composers – Site with a list of Russian composers on postage stamps
Indian Music Stamps
Music and Dance on Indian Stamps – A page featuring Indian music stamps
National Anthem Stamps
The Anthem Philatelist – A blog solely devoted to national anthem stamps
Pipe Organ Stamps
Pipe Organs of the World on Postage Stamps – An English-language site featuring pipe organ stamps
Hans Timmerman Organ Stamps – A German and English-language site featuring pipe organ stamps
Post Horn Stamps
Austrian 1945 post horn series – blog article
Germany, Weimar Republic post horn stamps – Identification guide
Germany (West) definitive series – 1951-52 post horn series information
Norwegian Post Horn Stamps – 1882-1929 information
Norwegian Post Horn Stamp – Identification Tool
Revenue Stamps (Music Related)
Adam Miller’s Stamps on Music –
The World-wide Catalogue & Handbook of Stamps issued under Copyright Acts, 2nd Edition,
Rock & Roll Stamps
Lick It Up: 118 Rock Star Postage Stamps – Article by VCR
Putting Their Stamp on the Music – Article by Rolling Stone