IIRC 'play/pause' doubles as 'select' in the menus and 'menu' doubles as 'back'. Putting them next to each other would seem to make it easier for people to not

IIRC 'play/pause' doubles as 'select' in the menus and 'menu' doubles as 'back'. Putting them next to each other would seem to make it easier for people to note and remember the relationship when navigating menus.