The music player applications cannot find my music files on my HDD unless I individually right-click on the song and select to play with gnome-music.
I am using SATAs to connect my two 4 terabyte HDDs to my motherboard permanently. I am using one of them to keep all of my media files. Tauon and gnome-music cannot find the music files on my HDDs. I use gnome disk to format and mount devices.