Note AcousticBrainz shutdown in README

but don't bother to remove all instances from Sphinx docs for now ->
A quickfix!

README.md

@@ -8,7 +8,7 @@
 D i s c o  /                /        /  - The geekiest DJ tool on the planet
           /_______/\_______/________/
 ```
-DiscoDOS helps a DJ remember and analyze what they played in their sets, or what they could possibly play in the future. It's based on data pulled from a users [Discogs](https://www.discogs.com) record [collection](https://support.discogs.com/hc/en-us/articles/360007331534-How-Does-The-Collection-Feature-Work-). Tracks can be organized into playlists and mix-transitions rated. Additionally the collection can be linked to the online music information services [MusicBrainz](https://musicbrainz.org) and [AcousticBrainz](https://acousticbrainz.org), thus further information (like musical key and BPM) is made available to the user.
+DiscoDOS helps a DJ remember and analyze what they played in their sets, or what they could possibly play in the future. It's based on data pulled from a users [Discogs](https://www.discogs.com) record [collection](https://support.discogs.com/hc/en-us/articles/360007331534-How-Does-The-Collection-Feature-Work-). Tracks can be organized into playlists and mix-transitions rated. Additionally the collection can be linked to the online music information services [MusicBrainz](https://musicbrainz.org) ~~and [AcousticBrainz](https://acousticbrainz.org), thus further information (like musical key and BPM) is made available to the user~~.
 
 DiscoDOS currently is available as a command line tool only, though prototypes of a mobile and a desktop app exist already. Despite of what the name implies, it's just the look that is reminiscent of the 80s/90s operating system, its usability follows most standards of a typical [shell](https://en.wikipedia.org/wiki/Shell_(computing)#Unix-like_systems) utility you would find on a [UNIX-like operating system](https://en.wikipedia.org/wiki/Unix-like).
 
@@ -19,6 +19,10 @@ DiscoDOS primarily aims at the Vinyl DJ but feature ideas for DJ's playing both,
 The following animated GIFs should give you an idea on how DiscoDOS looks and feels:
 
 
+_**Note: As of February 2022 unfortunately [the AcousticBrainz project was shut down](https://blog.metabrainz.org/2022/02/16/acousticbrainz-making-a-hard-decision-to-end-the-project/), as a consequence DiscoDOS can't fetch key and BPM anymore. Below videos are outdated and show some of those features.**_
+
+_**Note: Find some ideas on how DiscoDOS could solve this problem [in the website's roadmap chapter](https://discodos.jojotodos.net/#roadmap).**_
+
 
 <!-- omit in toc -->
 ##### Viewing mix details, searching and adding track: