It is better to call here lastPlayedSongs directly.

internal/radio/icecast.go

@@ -82,7 +82,7 @@ func IcecastLastSong(playlistPath string) (Song, error) {
 		return lastPlayedCache[len(lastPlayedCache)-1], nil
 	}
 
-	songs, err := IcecastLastPlayedSongs(1, playlistPath)
+	songs, err := lastPlayedSongs(1, playlistPath)
 	if len(songs) == 0 {
 		return Song{}, nil
 	}