Internet radio app for the elderly with the fewest possible number of button presses

Since I'm trying to help the elderly as a volunteer in town on all major
consumer platforms (Windows, Android & iOS) I need to find the simplest
Internet radio app (which has the fewest possible buttons to press).
You and I can swipe away ads & we can find the search button & we can skip
past obnoxious popups, etc. - but many elderly people can't easily do that.
Unfortunately, I can't find a free Internet radio app without ads & I can't
find a free Internet radio app without ads that doesn't require an account. But those are my restrictions. Luckily these elderly people ok with ads &
creating an account - so all we need is to find the fewest button presses.
What free Internet radio app do you recommend that is the easiest to use?
Preferably it requires zero button presses.
If not zero, then one or two which are in predictable locations.
However, all button presses should be predictable, big & obvious.
Any suggestions?