Daddy Kuma

It’s propietary

I used, but today I use Clementine (is still alive) and sometimes QMMP with some winamp skin

VLC It’s a good Music player if you only need to play music

As many have already told you, you can contribute to OSM, I have put in it almost all the establishments in my area (Not at Big area but…). Although soon I have to update them

You can convertí the files in another playable format with Handbrake, probably you Won’t need Change the codecs of the files only the container and the conversión will be fast than reencoding all