How can I get music players such as Rhythmbox and Clementine to copy music to the SD card on my Android phone (a Galaxy S4 running Lollipop and connected by USB) instead of the internal storage? In Samsung's MyFiles file manager on my phone I have set the SD card to be the default location for music, but both Rhythmbox and Clementine ignore this and put the music in the internal storage.

I would particularly like to get this working in Rhythmbox because Clementine has the additional problem of not being willing to create sub-folders for the music.