Moto G, Android 5.

The music I play on the phone is simply my favourite tracks which I've transferred from my laptop via cable, about 1.5GB in total. I buy all my music on CDs (mainly 50s or 60s compilations, plus some groups from that era), so I'm not interested in downloading music.

I didn't like the pre-installed Play Music app because I thought the interface was clumsy, so I read reviews of other music players. I settled on Shuttle, which works well, and looks like a stripped down Play Music.

While in Settings, and looking at details about apps generally, I selected the "Running" tab, and was surprised to see Shuttle listed. It was shown as running 1 process and 3 services, and a timer was running.

I uninstalled Shuttle, and enabled Play Music, to find that the same thing happened - even after turning the music off, it was still shown as running.

Does this matter? There were a few apps in there which, to my surprise were still running, after what should have been one-off use.

Of system memory, about half was occupied by 'system' and 'apps' , leaving about 50% free. Is it only the 'free' proportion which matters? Or can I switch apps off properly when I'm not using them?

I tried the icon at the bottom right (no idea of its correct name) to list all open apps, and swiped them out, but this made no difference.

You might want to read the following here, gives a good background to what your querying.

Thanks, that's an interesting article, and it sets my mind at rest. I won't worry about it in future - and I'll reinstall Shuttle.