I found someone asking the same question on a Galaxy Note forum, but no one had replied.
I love car mode on my S5, except for this stupid bug where it plays music in alphabetical order instead of track order when you ask it to play an album. If I say the same command using the "OK Google" feature outside of car mode, that works just fine.
Okay, so i put all my music on my SD card, and I want to play it through Google Play Music on my android Motorola Moto e phone. The music worked fine when it was on the phone's internal storage, but an SD card had to be used because i ran out of space. However, now when i try to play a song on my Sd card Google play music says "Couldn't play the track you requested".