Each year around Christmas, BBC Radio 3 broadcasts a couple of concerts that should be of interest to Broadway fans. This morning/last night, they had a Sondheim celebration, including a concert-style performance of Company, recorded at Hackney Empire in honor of his 75th birthday. Tonight/tomorrow, there's a Frank Loesser tribute which I believe includes a rendition of How to Succeed in Business Without Really Trying.
Now then: How can you listen to these? They were done for a show called Performance on 3 and this link, I believe, loads a Real Player version of the latest show. At the moment, that's the Sondheim broadcast. Starting some time tomorrow, that will probably be the Loesser salute. So that's one way if you act fast. If that doesn't work, look for a link on this page.
The Loesser show runs tomorrow at 19:30 U.K. time, which is 11:30 AM for those of us on the West Coast of the U.S. If you go to the BBC 3 Radio page at that time, you can listen live to it. So that's another.
In a day or so, they may have archive links up so you can listen at a more convenient time. And then again, they may not. If they do, I'll post them here.