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diff --git a/73.md b/73.md
index d883e79..545c961 100644
--- a/73.md
+++ b/73.md
@@ -20,6 +20,7 @@ There are certain established global content identifiers such as [Book ISBNs](ht
 | Geohashes              | "geo:`<geohash, lowercase>`"                               | "geo"                    |
 | Movies                 | "isan:`<id, without version part>`"                        | "isan"                   |
 | Papers                 | "doi:`<id, lowercase>`"                                    | "doi"                    |
+| Music pieces           | "isrc:`<id, uppercase>`"                                   | "isrc"                    |
 | Hashtags               | "#`<topic, lowercase>`"                                    | "#"                      |
 | Podcast Feeds          | "podcast:guid:`<guid>`"                                    | "podcast:guid"           |
 | Podcast Episodes       | "podcast:item:guid:`<guid>`"                               | "podcast:item:guid"      |