You would think for All Access subscribers they could integrate the "Listen to..." with Play Music / All Access. Right now for me the "Listen to" is completely useless. Since the last update of Assist / Touchless Controls, I cannot get "OK Google, listen to..." to work at all (and it barely worked before). Even when I ask it for something I have in my Play Music library and/or that I have listened to recently in Play Music, all it does is bring up Google search results. I have Play Music selected as my music player in the Driving Assist settings, but that seems to make no difference. All that happens when I am driving and set the car's audio mode to Bluetooth input is that Play Music opens and will play whatever I last listened to on my phone, provided I have not rebooted the phone in the interim. I can't get it to switch to different music with "Listen to..."
What I'd really like to happen when I'm driving and I ask to listen to something is that it should look in my Library and Recently Played items in Play Music, and if it doesn't find it there, search All Access Music, and go ahead and play whatever it thinks is the best match. Better yet, if it finds multiple matches, say what they are and ask you to pick, like what it does when I'm driving and ask it to call someone (it will ask do you want to call So-and-So Home, So-and-So Cell, etc.)
What I'd really like to happen when I'm driving and I ask to listen to something is that it should look in my Library and Recently Played items in Play Music, and if it doesn't find it there, search All Access Music, and go ahead and play whatever it thinks is the best match. Better yet, if it finds multiple matches, say what they are and ask you to pick, like what it does when I'm driving and ask it to call someone (it will ask do you want to call So-and-So Home, So-and-So Cell, etc.)