Classical Music Scanner (open source, ad-free)

Both Unpopular Music Player and Opus 1 Music Player use Android's media database. Unfortunately it is incomplete, error prone, and the update automatism is hardly to predict and unreliable. Sometimes it fails.

For music management the mentioned programs use their own tagger library to extract the missing and wrong information directly from the music files. This works, but the inconsistency problem remains.

The Classical Music Scanner creates its own database replacing that one of Android for the mentioned programs (if configured accordingly). However, this database does only contain information about audio files, neither pictures nor movies. Note that the tagger libraries in the music player applications are no longer used in this case.

The Classical Music Scanner is "open source", and it is also available via F-Droid (https://f-droid.org/packages/de.kromke.andreas.mediascanner/).