Is it just an omission of the word AND...or does someone really think there is such a thing as a 5.1 stereo track
According to the Cambridge English Dictionary:
Stereo: a device that plays recorded sound through two or more speakers, or sound produced this way.
We should use this definition to our advantage by reminding the labels that 5.1 is stereo. Then perhaps they will give us more stuff in 5.1 STEREO.