To GregH3000, you were asking some questions about saving the style for a song...

Just to explain why it works the way it does, a single song can exist in any number of playlists because you might need to play it with different singers, bands, (or rehearsals or practice at home). That single song can have different settings (key, tempo, playback style, repeats) depending on which playlist it is in. This is automatically remembered when you change these settings in the bottom menu for that song in that playlist. Think of them as overrides from the defaults (which are set in song edit).
When you edit a song (or create a new song) a playback style, key are saved as for song's defaults. If that song is already in a playlist where those settings have been changed (overridden), they are not affected, but any changes to chords, text added, changes to form will show. Exporting (sharing) a song from a playlist will have any overridden settings applied to it as it exports.

Also:
- a song in the song index might have overrides itself;
- the default key for the song can always be found in the (soft) transpose keys in the bottom menu (should you ever need to know it);
- iOS users can see the default styles for each song in the (smart) Styles index; in Mac they list in a separate column for each song title.