Source: cirosantilli/international-standard-music-number

= International Standard Music Number
{c}
{wiki}

= ISMN
{c}
{synonym}

Why was this so rarely used as of 2020s compared to <ISBN>s? It would have been perfect for helping find obscure records from <Chinese traditional music> and <Indian classical music>!

But instead we have <Discogs>, which is not too bad.