diff --git a/0a.md b/0a.md
new file mode 100644
index 00000000..80f847d9
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+++ b/0a.md
@@ -0,0 +1,80 @@
+NIP-0a
+======
+
+Audio Events
+---------------
+
+`draft` `optional`
+
+This NIP defines several new event kinds representing different types of audio track. These events
+are _parameterized replaceable_ as defined in [NIP-01](./01.md) and deletable per [NIP-09](09.md).
+
+Unlike a `kind 1` event with audio attached, audio events are intended to be surfaced in an audio-specific context
+rather than in a general micro-blogging context.
+
+The following kinds are defined by this NIP:
+
+- `31337` represents a music track
+- `31338` represents a podcast episode
+
+The following tags are required:
+
+- `d` is a unique identifier randomly generated by the client.
+- `media` is the url of the media. This SHOULD NOT be read, but is required for backwards compatibility reasons.
+- `imeta` is as described in [NIP 92](./92.md). Multiple `imeta` tags MAY be included to provide for different
+  use cases (e.g. streaming vs download).
+- `title` is the title of the audio track
+- `subject` is the title of the audio track (deprecated, but required for compatibility)
+
+The following tags are optional:
+
+- `i` is an external GUID in the format defined [here](https://github.com/MerryOscar/nips/commit/280eb498e0ac56b8f9356c1b7a88cc8b31579801).
+- `c` is the track's value as defined by a given category.
+- `website` is an external url to a website related to the track.
+- `duration` is the duration of the audio track, in seconds.
+- `published_at` is a timestamp representing the track's original publish date.
+
+Expected categories may include (but are not limited to):
+
+- `genre`
+- `subgenre`
+- `artist`
+- `record_label`
+- `producer`
+- `composer`
+- `album`
+- `track_number`
+- `tracks`
+- `bpm`
+- `year`
+
+Note that artists, producers, SHOULD be referred to using both a plaintext `c` tag AND a conventional `p` tag when pubkey is available. When doing so, the `p` tag's petname MUST be the same as the `c` tag's value. In this way `c` tags can be used to indicate genre, as well as artist, producer, etc.
+
+If included, `genre` and `subgenre` SHOULD be based on [this list](https://github.com/wavlake/genre-list).
+
+`content` SHOULD be summary or description of the audio content.
+
+Example:
+
+```json
+{
+  "id": <event_id>,
+  "pubkey": <author_pubkey>,
+  "created_at": <created_at>,
+  "kind": 31337,
+  "content": "Chill beats",
+  "tags": [
+    ["d", "<id>"],
+    ["c", "Pop", "genre"],
+    ["c", "EDM", "subgenre"],
+    ["c", "Columbia Records", "record_label"],
+    ["c", "AC/DC", "artist"],
+    ["i", "podcast:item:guid:123", "https://fountain.fm/episode/30uEXC25615Ze2ELjY2p"],
+    ["p", "2a07724d42fd8004b5c97b62ba03b6baf3919f9e8211667039987866997e97ad", "wss://my-relay.com", "AC/DC"],
+    ["title", "Platinum Robots on the Moon"],
+    ["subject", "Platinum Robots on the Moon"],
+    ["published_at", "<published_at>"],
+    ["imeta", "url https://example.com/my-track.m3u8", "x <hash>", ...]
+  ]
+}
+```
diff --git a/51.md b/51.md
index 23d5b999..1348df1f 100644
--- a/51.md
+++ b/51.md
@@ -54,6 +54,8 @@ Aside from their main identifier, the `"d"` tag, sets can optionally have a `"ti
 | Kind mute sets | 30007 | mute pubkeys by kinds<br>`"d"` tag MUST be the kind string                                  | `"p"` (pubkeys)                                                                   |
 | Interest sets | 30015 | interest topics represented by a bunch of "hashtags"                                         | `"t"` (hashtags)                                                                  |
 | Emoji sets    | 30030 | categorized emoji groups                                                                     | `"emoji"` (see [NIP-30](30.md))                                                   |
+| Music Playlist        | 30037 | a list of kind `31337` music tracks                                                          | `"a"` (kind:31337 music tracks)                                                   |
+| Podcast Playlist      | 30038 | a list of kind `31338` podcast episodes                                                      | `"a"` (kind:31338 podcast episodes)                                               |
 | Release artifact sets | 30063 | groups of files of a software release  | `"e"` (kind:1063 [file metadata](94.md) events), `"i"` (application identifier, typically reverse domain notation), `"version"`  |
 
 ### Deprecated standard lists
diff --git a/README.md b/README.md
index eb6fd94a..17588dc3 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 - [NIP-07: `window.nostr` capability for web browsers](07.md)
 - [NIP-08: Handling Mentions](08.md) --- **unrecommended**: deprecated in favor of [NIP-27](27.md)
 - [NIP-09: Event Deletion Request](09.md)
+- [NIP-0a: Audio Tracks](0a.md)
 - [NIP-10: Conventions for clients' use of `e` and `p` tags in text events](10.md)
 - [NIP-11: Relay Information Document](11.md)
 - [NIP-13: Proof of Work](13.md)
@@ -213,6 +214,8 @@ They exist to document what may be implemented by [Nostr](https://github.com/nos
 | `30618`       | Repository state announcements  | [34](34.md)                            |
 | `30818`       | Wiki article                    | [54](54.md)                            |
 | `30819`       | Redirects                       | [54](54.md)                            |
+| `31337`       | Music Track                     | [0a](0a.md)                            |
+| `31338`       | Podcast Episode                 | [0a](0a.md)                            |
 | `31388`       | Link Set                        | [Corny Chat][cornychat-linkset]        |
 | `31890`       | Feed                            | [NUD: Custom Feeds][NUD: Custom Feeds] |
 | `31922`       | Date-Based Calendar Event       | [52](52.md)                            |