I was wondering if it would work creating a second type of app, a Service, that has no gui and only runs in the background. They'd have an api that allows them

I was wondering if it would work creating a second type of app, a Service, that has no gui and only runs in the background. They'd have an api that allows them to communicate with a regular app. This way, something like Pandora could be split in two, with the background service running constantly, but the gui closing as usual. This make it easier to manage background tasks, and also eliminate the problem of users leaving all their apps running. I guess if the makers of a Service decided to make their api public, other people could develop alternate front ends for it as well.