Simple Scrobbler

Scrobbling means submitting listening information to Last.fm and/or Libre.fm;
you can then get music recommendations and view your listening history and
statistics. Most media players will work. Older android versions pre-Lollipop,
the media player that you use must be able to work with the API e.g.
https://f-droid.org/packages/org.kreed.vanilla or https://f-droid.org/packages/jp.co.kayo.android.localplayer. Apps can also hook
into the Now-Playing broadcast: for example, https://f-droid.org/packages/com.jlyr can use it to grab
lyrics.

More info about scrobbling can be found on
Last.fm's FAQ.