Hello! I’ve actually been working on this all day and have located two live streams, neither of which work in the US, one of which seems to only work in Portugal, and the other may work across Europe but I’m not sure. My European and Portuguese followers can correct this information if it is wrong.
I am so sorry if neither of these streams work for you. If it is any consolation, I have secured access to both streams and am prepared to record audio if Mumford & Sons appear for an interview or if their set is broadcast (they’re scheduled to take the stage at 20:45 local time). I will keep you updated.
As an aside, the Rádio Comercial Facebook page, in addition to stating that they will announce the remaining schedule throughout the day, posted a wall photo of a limited stream schedule that says, “Stay tuned, throughout the day we have more surprises ;)” You might consider clicking over to that page and kindly suggesting Mumford & Sons.
Thanks for the question and I hope this helps.